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Ejukonemu, Barbie O. M. "Refracting The Diseased Eye". Bayero Journal of Nursing and Health Care 3, nr 2 (11.09.2022): 893–97. http://dx.doi.org/10.4314/bjnhc.v3i2.9.
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Refractive error refers to ocular refractive status where images of objects of regard do not fall on the retina in a relaxed eye - the ametropic eye. Thus, objects are perceived as blur. Refractive error is an aberration in an otherwise normal physiological phenomenon and not a disease. Uncorrected refractive errors are the second most causes of blindness after cataract and the cause of almost half of visual impairment. Clinical refraction is a careful scientific procedure employed to correct refractive error. Given that refractive error is the most common reason patients present to the eye care practitioner, a lot of attention must be given to refraction. When an irreversible eye disease co-exist with refractive error, then correction of refractive error under this circumstance; refracting the diseased eye (RDE) become very challenging and painstaking. There will be likelihood of irregularities in the transparent refractive surfaces of the eye due to disease or surgery which make refraction difficult both for the patient and the examiner. Personal clinical experience of the author who is a low vision consultant and review of related literature from textbooks and journals are brought to bear in this article. This paper is a review of the RDE algorithm with delineation of these steps to enable an effective refractive endpoint for the eye with disease. The paper will enable young Optometrists to deal with refractive error masquerading irreversible eye disease. It is also an essential reading for the low vision Optometrist in mastering the art and science of low vision refraction.
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Godar, Srijana Thapa. "MAGNITUDE OF REFRACTIVE ERRORS IN CHILDREN IN TERTIARY CARE HOSPITAL OF WESTERN NEPAL". Journal of Chitwan Medical College 10, nr 2 (25.06.2020): 54–58. http://dx.doi.org/10.54530/jcmc.167.
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Background: Refractive error is one of the most common causes of the visual impairment and second leading cause of treatable blindness. The objective of the study was to determine the magnitude of refractive errors in children.
Methods: This was a hospital based cross-sectional study conducted on 254 children attending Ophthalmology OPD of Manipal Teaching Hospital, Pokhara. The children whose visual acuity was worse than 6/6 but improved with pinhole were included in this study. Vision test, retinoscopy and subjective refraction was done in all subjects and cycloplegic refraction was done when needed. Statistical analysis was carried out using Epi-info version 7.
Results: The commonest type of refractive error was astigmatism (46.06%) followed by myopia (42.31%). Majority of children had low grade of refractive errors (46.85%). Among the children, “with the rule astigmatism” was maximum (27.56%). Majority of children were in the age between 11 to 15 years (77.95%). The refractive error was seen more in female (63.78%). Among the children of refractive errors, 29.13% had family history, 33.46% had given the history of wearing spectacles and 10.24% children had amblyopia. There was statistically significant association between refractive errors and age groups, history of wearing spectacles, amblyopia and grading of refractive errors. However, there was no statistically significant association of refractive error with gender, residence and family history.
Conclusions: Astigmatism was the common type of refractive error followed by myopia. This study emphasizes the importance of detection of refractive error in children.
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Godar, Srijana Thapa. "Magnitude of refractive errors in children in tertiary care hospital of western Nepal". Journal of Chitwan Medical College 10, nr 2 (25.06.2020): 54–58. http://dx.doi.org/10.3126/jcmc.v10i2.29674.
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Background: Refractive error is one of the most common causes of the visual impairment and second leading cause of treatable blindness. The objective of the study was to determine the magnitude of refractive errors in children.
Methods: This was a hospital based cross-sectional study conducted on 254 children attending Ophthalmology OPD of Manipal Teaching Hospital, Pokhara. The children whose visual acuity was worse than 6/6 but improved with pinhole were included in this study. Vision test, retinoscopy and subjective refraction was done in all subjects and cycloplegic refraction was done when needed. Statistical analysis was carried out using Epi-info version 7.
Results: The commonest type of refractive error was astigmatism (46.06%) followed by myopia (42.31%). Majority of children had low grade of refractive errors (46.85%). Among the children, “with the rule astigmatism” was maximum (27.56%). Majority of children were in the age between 11 to 15 years (77.95%). The refractive error was seen more in female (63.78%). Among the children of refractive errors, 29.13% had family history, 33.46% had given the history of wearing spectacles and 10.24% children had amblyopia. There was statistically significant association between refractive errors and age groups, history of wearing spectacles, amblyopia and grading of refractive errors. However, there was no statistically significant association of refractive error with gender, residence and family history.
Conclusions: Astigmatism was the common type of refractive error followed by myopia. This study emphasizes the importance of detection of refractive error in children.
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Yadav, Himanshu Kumar, Snigdha Sen, Preeti Gupta, Renu Agrawal i Niranjan Singh. "Assessment of Refractive Status of 5-15 Years Old Children Attending Government Schools of Rural Agra". Healthline 13, nr 1 (31.03.2022): 61–66. http://dx.doi.org/10.51957/healthline_304_2021.
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Introduction: In children uncorrected refractive errors have a profound effect on educational and psychosocial development hence it is necessary to estimate the prevalence both at the community and at the school level to aid planning and implementation of refractive error services in children. Objective: To determine the refractive status of 5 to 15 years old children attending government schools of rural areas of district Agra, Uttar Pradesh (UP), India. Method: Study conducted on 902 students of age group 5-15 years of randomly selected government schools of Bichpuri Block of district Agra. Children underwent visual acuity assessment and torch light examination, height and weight measurement. Children with VA ≤6/9 were further examined and cycloplegic retinoscopy, fundus examination, slit lamp examination and post mydriatic refraction was done. On the basis of values of cycloplegic refraction and post mydriatic refraction, refractive error was classified as myopia, hypermetropia and astigmatism. Statistical Analysis was done by applying Chi square test. Result: Out of 902 children, 125 children (13.86 %) were having refractive error of which 76 were myopic (8.43%), 39 were astigmatic (4.32%) and 10 were hypermetropic (1.11%). There was an increase in the overall prevalence of refractive error with advancing age. There was no significant association of refractive error with gender and nutritional status. Conclusion: Vision screening of school children is very useful for early detection and correction of refractive errors. Screening of the refractive errors in school should be carried out periodically and regularly.
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Kerkar, Sheela, i Apurva Thombre. "An observational study to evaluate the prevalence and pattern of refractive errors in children aged 3-17 years in Mumbai, India". International Journal of Contemporary Pediatrics 7, nr 5 (24.04.2020): 1028. http://dx.doi.org/10.18203/2349-3291.ijcp20201632.
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Background: Refractive error is one of the most important causes of avoidable visual impairment. Early detection of refractive error in children is essential to avoid any permanent disability. The objective of the study was to determine the prevalence and pattern of refractive errors as per age, gender and educational standard in school children aged 3-17 years.Methods: This was an observational non-interventional study. 600 eyes of 300 participants in the age group of 3-17 years were evaluated. All underwent cycloplegic refraction followed by objective refraction. Participants were divided into 3 groups as follows 3-8 years, 9-12 years and 13-17 years and evaluation of type of refractive error was done age wise and gender wise.Results: The number of male and female participants was almost similar with a male:female ratio of 1.02:1. Refractive errors were most common in the age group of 9-12 years. The most common refractive error was astigmatism followed by myopia and hypermetropia. It was also found that majority of patients had bilateral refractive errors.Conclusions: The most common refractive error was astigmatism followed by myopia and hypermetropia. It was also found that majority of patients had bilateral refractive errors. The visual acuity in majority was 6/18 which according to WHO classification falls in Category 0 of Visual impairment in India.
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Taludhar, S., i S. Dhakal. "Refractive Error Profile in a Tertiary Centre in Western Nepal". International Journal of Infection and Microbiology 2, nr 2 (20.07.2013): 59–63. http://dx.doi.org/10.3126/ijim.v2i2.8324.
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INTRODUCTION: Refractive error is one of the causes of avoidable blindness. Myopia, hypermetropia and astigmatism are the common types of refractive error. Not many studies are done to detect pattern of refractive error in Western Nepal. So, the study will determine the prevalence and distribution of refractive errors. MATERIALS AND METHODS: A prospective study of all consecutive patients of age less than 40 years who visited eye department, Gandaki Medical College, between May 2010 and May 2011 was conducted. Visual acuity, naked eye and pin hole examination was done by ophthalmic assistant with cycloplegic refraction when needed. Those who did not turn up for refraction were excluded from the study. RESULTS: A total of 601 patients were seen within the study period. Mean age of male patients was 22.4 years }0.6 (95% CI, 21.2-23.6 years) and mean age of female patients was 24.2 years }0.5 (95% CI, 23.2-25.2 years). Majority of the patients were in age group 11-20 years (39.3%). Myopia was the most common refractive error (43.3%) followed by simple myopic astigmatism (23.8%). Refractive errors were more common in females. CONCLUSIONS: Myopia was the commonest refractive compared to hypermetropia. Refractive error was more common in females than in males. Such studies help to know the picture of refractive errors in community and such reports are helpful in planning programme to prevent avoidable blindness.DOI: http://dx.doi.org/10.3126/ijim.v2i2.8324 Int J Infect Microbiol 2013;2(2):59-63
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Al Bahhawi, Tariq, Anwar M. Makeen, Hadi Hassan Daghreeri, Mohannad Faisal Tobaigy, Abdulrahman Mohammed Adawi, Faisal Mohammed Guhal, Murad Abdullah Akkur i in. "Refractive Error among Male Primary School Students in Jazan, Saudi Arabia: Prevalence and Associated Factors". Open Ophthalmology Journal 12, nr 1 (28.09.2018): 264–72. http://dx.doi.org/10.2174/1874364101812010264.
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Background: Refractive error is a common and serious eye disorder that affects more than 153 million people globally. The aim of this study was to estimate the prevalence and pattern of refractive error among male primary school children in Jazan region, Saudi Arabia. Methods: A cross-sectional study was conducted among a randomly selected group of 395 students (aged 6-14 years) in Jazan region, Southwest Saudi Arabia. An optometrist and medical students assessed the refraction error using an autorefractor, a Snellen E chart and retinoscopy. Results: The overall prevalence of uncorrected refractive error in either eye was, 22% higher among rural students. The most prevalent refractive error was hyperopia (32.2%) followed by myopic astigmatism (31%) then myopia (17.2%). Next were hyperopic astigmatism (16.1%) and mixed astigmatism (3.5%). The following variables were associated with a higher risk of refractive errors and myopia: living in rural areas, having parents with refractive errors, spending more time on electronic devices and shorter visual distances. Conclusion: Refractive error was highly prevalent among primary school children in Jazan, Saudi Arabia. The rural students were more affected by refractive errors, mainly hyperopia. The preschool vision test should be reconsidered, and a periodic vision examination should be applied to detect vision problems as early as possible.
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Hazarika, Himanto Nath, Dipak Bhuyan, Suranjana Chaliha Hazarika i Sujit Addya. "Refractive errors in age group seven to fifteen years: North-east India scenario". International Journal Of Community Medicine And Public Health 4, nr 6 (22.05.2017): 1928. http://dx.doi.org/10.18203/2394-6040.ijcmph20172151.
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Background: The objectives of study were to find out the different types of refractive errors in children between seven to fifteen years age group and the cause of uncorrected defective vision.Methods: A prospective study was designed of two thousand children aged between seven to fifteen years, attending outpatient department. Study period was one year. Consent was obtained from their guardian. Inclusion criteria were children with refractive errors. Children presenting with organic defects of ocular structures, infections, corneal opacity, cataract, choroid and retinal disorders were excluded from study. Data were collected by history taking and comprehensive ocular examination, visual tests for both near and distant vision. Refractive error assessed by cycloplegic drug with one percent Homatropine eye drops, by streak retinoscopy. Objective refraction were carried out and documented. Subjective refraction was done after one week. Both BCVA and uncorrected refractive errors were ascertained and recorded.Results: Out of two thousand children examined, myopic = 34%, hypermetropic = 11%, and astigmatic = 55%. M: F = 900:1000. Study showed headache as the commonest symptom. 17% of the patients had positive family history. Correctable errors constitute 91% of the total cases.Conclusions: Myopic astigmatism was found to be the most frequent refractive error in children. Mass screening is required for early diagnosis of refractive error. Prescribing corrective glasses for children with refractive errors at an early age will prevent childhood morbidity.
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Chean, Chung Shen, Boon Kang Aw Yong, Samuel Comely, Deena Maleedy, Stephen Kaye, Mark Batterbury, Vito Romano, Esmaeil Arbabi i Victor Hu. "Refractive outcomes following cataract surgery in patients who have had myopic laser vision correction". BMJ Open Ophthalmology 4, nr 1 (kwiecień 2019): e000242. http://dx.doi.org/10.1136/bmjophth-2018-000242.
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ObjectivePrediction errors are increased among patients presenting for cataract surgery post laser vision correction (LVC) as biometric relationships are altered. We investigated the prediction errors of five formulae among these patients.Methods and analysisThe intended refractive error was calculated as a sphero-cylinder and as a spherical equivalent for analysis. For determining the difference between the intended and postoperative refractive error, data were transformed into components of Long's formalism, before changing into sphero-cylinder notation. These differences in refractive errors were compared between the five formulae and to that of a control group using a Kruskal-Wallis test. An F-test was used to compare the variances of the difference distributions.Results22 eyes post LVC and 19 control eyes were included for analysis. Comparing both groups, there were significant differences in the postoperative refractive error (p=0.038). The differences between the intended and postoperative refractive error were greater in post LVC eyes than control eyes (p=0.012), irrespective of the calculation method for the intended refractive error (p<0.01). The mean difference between the intended and postoperative refractive error was relatively small, but its variance was significantly greater among post LVC eyes than control eyes (p<0.01). Among post LVC eyes, there were no significant differences between the mean intended target refraction and between the intended and postoperative refractive error using five biometry formulae (p=0.76).ConclusionBiometry calculations were less precise for patients who had LVC than patients without LVC. No particular biometry formula appears to be superior among patients post LVC.
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Ismail, Lili Asma, i Sheiladevi Sukumaran. "Prevalence of refractive errors among school children in Wangsa Maju, Kuala Lumpur, Malaysia". Medical hypothesis, discovery & innovation in optometry 3, nr 3 (30.12.2022): 106–12. http://dx.doi.org/10.51329/mehdioptometry158.
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Background: Uncorrected refractive error is the most common cause of vision impairment and the second leading cause of blindness worldwide. Its prevalence differs among and within countries. This study was aimed at exploring the pattern and prevalence of refractive error among school children in the Wangsa Maju Township, Kuala Lumpur, Malaysia.
Methods: A stratified, multistage, cluster random sampling in a geographically defined area was employed, and 245 school children, aged 8–12 years, from two primary schools in Wangsa Maju Township, Kuala Lumpur, were recruited. The cross-sectional study employed interviewing, measuring uncorrected distance visual acuity (UCDVA) using the Snellen chart, cycloplegic refraction under a streak retinoscope refined subjectively, and a detailed slit-lamp examination to assess the anterior and posterior segments. Myopia, hyperopia, and astigmatism were defined as spherical equivalent (SE) greater than or equal to - 0.50, SE greater than or equal to + 2.00, and cylindrical greater than or equal to 0.75 D, respectively. Reduced UCDVA was defined as an unaided visual acuity < 6/9.
Results: The mean (standard deviation) age of the participants was 10.42 (1.22) years. The overall prevalence of refractive error was 47.8%. Of 245 screened school children, including 42 (35.9%) boys and 75 (64.1%) girls, 117 had refractive error, with a prevalence of refractive error of 17.1% and 30.6% in boys and girls, respectively. Myopia was the most common type (30.2%), followed by astigmatism (16.3%) and hyperopia (1.2%). The prevalence of reduced UCDVA was 36.3% among the screened school children, attributable to refractive error with a significantly high positive correlation (r = +.721; P < 0.01). Among those with refractive errors, sex differences in the magnitude of refractive errors were not statistically significant in the three types of refractive errors (all P > 0.05).
Conclusions: The prevalence of refractive error among primary school children in Wangsa Maju Township, Kuala Lumpur, Malaysia was 47.8%; girls outnumbered boys, but the magnitude of refractive errors showed no sex differences. The prevalence of reduced UCDVA was 36.3%, attributable to refractive error. Irrespective of sex, myopia had the highest prevalence compared to other refractive errors, and its prevalence increased with age. Future population-based studies are required to address the limitations concerning environmental risk factors for refractive error and the impact of ethnic or familial backgrounds on their prevalence in a similar but larger population using the same protocol.
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Aggarwal, Aditya, Siddhartha Gairola, Uddeshya Upadhyay, Akshay P. Vasishta, Diwakar Rao, Aditya Goyal, Kaushik Murali, Nipun Kwatra i Mohit Jain. "Towards Automating Retinoscopy for Refractive Error Diagnosis". Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies 6, nr 3 (6.09.2022): 1–26. http://dx.doi.org/10.1145/3550283.
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Refractive error is the most common eye disorder and is the key cause behind correctable visual impairment, responsible for nearly 80% of the visual impairment in the US. Refractive error can be diagnosed using multiple methods, including subjective refraction, retinoscopy, and autorefractors. Although subjective refraction is the gold standard, it requires cooperation from the patient and hence is not suitable for infants, young children, and developmentally delayed adults. Retinoscopy is an objective refraction method that does not require any input from the patient. However, retinoscopy requires a lens kit and a trained examiner, which limits its use for mass screening. In this work, we automate retinoscopy by attaching a smartphone to a retinoscope and recording retinoscopic videos with the patient wearing a custom pair of paper frames. We develop a video processing pipeline that takes retinoscopic videos as input and estimates the net refractive error based on our proposed extension of the retinoscopy mathematical model. Our system alleviates the need for a lens kit and can be performed by an untrained examiner. In a clinical trial with 185 eyes, we achieved a sensitivity of 91.0% and specificity of 74.0% on refractive error diagnosis. Moreover, the mean absolute error of our approach was 0.75±0.67D on net refractive error estimation compared to subjective refraction measurements. Our results indicate that our approach has the potential to be used as a retinoscopy-based refractive error screening tool in real-world medical settings.
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ALAM, MOHAMMAD, i MOHAMMAD FAREED. "REFRACTIVE ERRORS". Professional Medical Journal 18, nr 04 (10.12.2011): 649–53. http://dx.doi.org/10.29309/tpmj/2011.18.04.2656.
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Objective: To know the profile of refractive errors in school age children in DHQ Hospital Karak and group of teaching Hospitals Bannu. Setting: DHQ Hospital Karak and group of Teaching hospitals Bannu. Period: Two years study from August 2007 to August 2009. Design: Descriptive study. Materials & Methods: A work up proforma was prepared for record of children. School age children with age range from 5 to 15 years who attended the eye OPD were documented and informed consents were taken from children and their parents. They were screened for refractive errors with retinoscopy. In some children cycloplegic refraction was done.Fundoscopy was also done to exclude any lesion causing visual impairment in some children .Refractive errors was noted as spherical equivalent of myopia and hypermetropia in children who had both spherical and cylindrical error while in those children who had only cylindrical error were assigned as astigmatism .Children with any organic lesion in cornea lens and fundi were excluded from study. Results: Total 2680 school age children with age range from 5 to 15 years were examined out of which 1560(58.20%) were male and 1120(41.8%) were female.1688(62.98%) children were emmetropic while 992(37.01%) had refractive error .Spherical equivalent of myopia was present in 541(54.53%) while that of hypermetropia in 360 (36.29%)children. Astigmatism was present in 91(9.17%) children. Conclusions: Refractive error is a common ocular disorder affecting school age children. Myopia is more common followed by hypermetropia. Therefore routine careful visual check up in school age children should be carried out.
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Akhter, Waseem, Erum Yousafzai, Afia Matloob Rana i Shakaib Anwar. "Refractive Errors: Prevalence and Pattern among Rural Population of Islamabad, Pakistan". Journal of Islamabad Medical & Dental College 9, nr 2 (29.06.2020): 103–8. http://dx.doi.org/10.35787/jimdc.v9i2.326.
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Background: Refractive error is the most common cause of correctable visual loss worldwide. Decreased vision due to refractive error can be easily corrected with the help of spectacles, contact lenses and refractive surgery. However, there are 42% of uncorrected refractive errors all over the world. The present study aimed to evaluate different kinds of refractive errors, its prevalence and pattern in patients from rural areas who visited our hospital in the last five years.
Material and Methods: This cross-sectional study enrolled 2,138 patients, who visited eye OPD at Rawal Institute of Health Sciences, Islamabad during a period of five years i.e. from September, 2013 to September, 2018. Patients having only refractive error with an age of five years and above were included in the study. All patients had objective refraction with automated refractometer followed by subjective refraction. Data was entered and analyzed in SPSS version 20.0. Chi-square test was used for comparing groups with a P-value of <0.05 considered as statistically significant.
Results: Compound myopic astigmatism was the most common error found in our study population (n=575; 26.9%). The second most frequent complaint was simple myopia (n=501; 23.4%) followed by presbyopia (n=441; 20.6%) and mixed astigmatism (n=235; 11%). Patients with more than one refractive error included 178 (8.3%) with mixed astigmatism and presbyopia and 78 (3.6%) with simple myopia and presbyopia. Compound myopic astigmatism was more prevalent in younger ages compared to older age groups (46.4% vs 19.9%) (P <0.001). Mixed astigmatism (12.4% vs 8.9%), simple myopia (23.8% vs 22.9%) and presbyopia (21.3% vs 19.5%) were slightly greater in females than males (P=0.07), respectively.
Conclusions: The prevalence of myopia is significantly higher among female population and young individuals. Mixed astigmatism combined with presbyopia is more common among elderly population.
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ETHEL, E. NILA, i Dr P. NAGALAKSHMI Dr. P. NAGALAKSHMI. "Early Intervention Measures for Refractive Error". Indian Journal of Applied Research 4, nr 8 (1.10.2011): 1–3. http://dx.doi.org/10.15373/2249555x/august2014/186.
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Mohmand, Naveed Ahmad, Rozina Shahadat Khan, Abid Ullah i Abid Alam. "Refractive Errors in Children of 11 to 16 Years of Age Group attending Eye OPD at Hayatabad Medical Complex Peshawar". Pakistan Journal of Medical and Health Sciences 16, nr 10 (30.10.2022): 46–48. http://dx.doi.org/10.53350/pjmhs22161046.
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Background: Children of school age are susceptible to refractive error, which has a significant negative influence on lowering the learning capacity and educational potential. Aim: To estimate the frequency of different types of refractive erors in children, age group 11 to 16 year, visiting eye OPD H.M.C Peshawar. Study Design: Cross sectional descriptive study. Place and duration of study: Study has been conducted at Eye OPD of H.M.C Peshawar in three months duration. Methods: A total of 308 patients fulfilling the inclusion criterion were examined for Visual acuity. Distance visual acuity was measured both monocularly and binocularly by using a Snellen E chart at a distance of 6 meter. After refraction, best corrected visual acuity was assessed and recorded. Refractive status was recorded according to the criterion. Results: A total of 308 subjects were examined, out of which 73 (23%) were having Ammetropia i.e. having refractive error. Among 73 refractive error children 27 (36.98 %) were having Myopia and 24 (32.87%) were having Hyperopia and 22 (30.13%) were Astigmatic. It was found that male were more affected than females, having frequency of 63% and 36.98% respectively. Conclusion: Refractive error can no longer be ignored as a target for urgent action. The world must make every effort to meet the goals of VISION 2020. A child’s whole life may get ruined just because of uncorrected or inappropriately corrected Refractive error. There is dire need of public awareness regarding refractive errors and availability of services. The results show a great burden of refractive error patients on the hospital, so the facilities of the refractive services need to be increased. Keywords: Refractive error, visual acquity, Ammetropia, Hyperopia, Myopia
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Shrestha, Shristi, i Khem Raj Kaini. "Refractive errors in type II diabetic patients". Journal of Universal College of Medical Sciences 3, nr 3 (31.12.2015): 17–21. http://dx.doi.org/10.3126/jucms.v3i3.24243.
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INTRODUCTION: The prevalence of diabetes is increasing rapidly. Refractive error in the diabetic population is considered a main cause of visual impairment. So this study was conducted to find out the pattern of refractive errors in patients with type II diabetes mellitus in Western Nepal.
MATERIAL AND METHODS: It was a hospital-based cross-sectional study. Three hundred forty eyes of one hundred seventy patients with type II diabetes underwent comprehensive eye examination including subjective and objective refraction and serum biochemistry.
RESULTS: The mean refraction was -0.132±0.88 D. Emmetropia was seen in 49.7% of the patients, hypermetropia in 22.6%, myopia in 12.6%, and astigmatism in 15% of the patients. Older age groups had more hypermetropic refractive error (p<0.05). Female gender was a risk factor for hypermetropia (p=0.042). Good glycemic control was seen in 49.7%. There was statistically significant correlation between fasting blood sugar level and spherical equivalent refraction (p<0.05, r = -0.115).
CONCLUSION: The present hospital-based study noted a refractive error in 50.3% among diabetic population in Pokhara with hypermetropia being the most common type (22.6%) than myopia (12.6%) and astigmatism (15%).
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Ohlendorf, Arne, Alexander Leube i Siegfried Wahl. "Advancing Digital Workflows for Refractive Error Measurements". Journal of Clinical Medicine 9, nr 7 (12.07.2020): 2205. http://dx.doi.org/10.3390/jcm9072205.
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Advancements in clinical measurement of refractive errors should lead to faster and more reliable measurements of such errors. The study investigated different aspects of advancements and the agreement of the spherocylindrical prescriptions obtained with an objective method of measurement (“Aberrometry” (AR)) and two methods of subjective refinements (“Wavefront Refraction” (WR) and “Standard Refraction” (StdR)). One hundred adults aged 20–78 years participated in the course of the study. Bland–Altman analysis of the right eye measurement of the spherocylindrical refractive error (M) identified mean differences (±95% limits of agreement) between the different types of measurements of +0.36 D (±0.76 D) for WR vs. AR (t-test: p < 0.001), +0.35 D (± 0.84 D) for StdR vs. AR (t-test: p < 0.001), and 0.0 D (± 0.65 D) for StdR vs. WR (t-test: p < 0.001). Monocular visual acuity was 0.0 logMAR in 96% of the tested eyes, when refractive errors were corrected with measurements from AR, indicating that only small differences between the different types of prescriptions are present.
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Aham-Onyebuchi, UO, OO Jagun, A. Betiku, O. Olijide i M. Leshi. "The Prevalence and Pattern of Refractive error in Ogun State, Nigeria". Babcock University Medical Journal (BUMJ) 1, nr 2 (30.06.2015): 20–26. http://dx.doi.org/10.38029/bumj.v1i2.9.
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Objective: To determine the prevalence and pattern of refractive errors in Ogun State, Nigeria. The prevalence of blindness was also determined.
Method: A cross sectional descriptive survey. Participants aged 15years and above were randomly selected from 1125 attendees of different community medical outreaches conducted in 5 Local government areas of Ogun State between August 2012 and March 2013. Participants underwent ocular examination and refraction (automated objective and subjective assessments).
Results: The sample consisted of 780 participants. Their mean age was 49.14 (±18.37), and 52.8% were females. About two-thirds [67.7%] had presenting visual acuity [VA] of at least 6/18, while 14.3% were legally blind [VA worse than 3/60].Astigmatism was the most prevalent refractive error [40%] but on conversion tospherical equivalents, hyperopia [28.5%] became the most prevalent error. Apart from refractive errors, cataract and glaucoma were found to be the other major causes of visual impairment amongst the respondents.
Conclusion: The prevalence of refractive errors and blindness in the study population was higher than previously documented with hyperopia being the most prevalent spherical equivalent refractive error. An urgent integration of primary eye care into the existing primary health care system for prevention of blindness is advocated.
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Khoramnia, Ramin, Gerd Auffarth, Grzegorz Łabuz, George Pettit i Rajaraman Suryakumar. "Refractive Outcomes after Cataract Surgery". Diagnostics 12, nr 2 (19.01.2022): 243. http://dx.doi.org/10.3390/diagnostics12020243.
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A post-operative manifest refractive error as close as possible to target is key when performing cataract surgery with intraocular lens (IOL) implantation, given that residual astigmatism and refractive errors negatively impact patients’ vision and satisfaction. This review explores refractive outcomes prior to modern biometry; advances in biometry and its impact on patients’ vision and refractive outcomes after cataract surgery; key factors that affect prediction accuracy; and residual refractive errors and the impact on visual outcomes. There are numerous pre-, intra-, and post-operative factors that can influence refractive outcomes after cataract surgery, leaving surgeons with a small “error budget” (i.e., the source and sum of all influencing factors). To mitigate these factors, precise measurement and correct application of ocular biometric data are required. With advances in optical biometry, prediction of patient post-operative refractory status has become more accurate, leading to an increased proportion of patients achieving their target refraction. Alongside improvements in biometry, advancements in microsurgical techniques, new IOL technologies, and enhancements to IOL power calculations have also positively impacted patients’ refractory status after cataract surgery.
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McCarty, C. A. "Uncorrected refractive error". British Journal of Ophthalmology 90, nr 5 (1.05.2006): 521–22. http://dx.doi.org/10.1136/bjo.2006.090233.
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Balicka, Agnieszka, Ireneusz Balicki, Alexandra Trbolova, Mateusz Szadkowski i Aleksandra Tomkowicz. "Refractive state of eyes in dogs". Medycyna Weterynaryjna 74, nr 3 (2018): 151–55. http://dx.doi.org/10.21521/mw.6083.
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The article discusses refractive errors in dogs. The refractive errors presented in the article are myopia, hyperopia, anisometropia and astygmatism. These disadvantages are discussed in individual dogs breeds. Analysis has proved that most of dogs are emmetropic an thus have normal visual acuity. In dogs and human alike the refraction defect may have a genetic compound, it may be congenital or acquired and may change with age. Ametropia directly affects the orientation of animals and their behavior, therefore examination for refractive error is an important element of vision testing. .
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Awasthi, S., B. P. Pant i T. Langaas. "Refractive Error Prevalence among School Children in Dadeldhura District of Nepal". Kathmandu University Medical Journal 18, nr 2 (4.12.2020): 46–51. http://dx.doi.org/10.3126/kumj.v18i2.33225.
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Background Uncorrected refractive error is the major cause of visual impairment worldwide. There is no data on refractive error prevalence among school children in hilly region of Far West Nepal.
Objective The prevalence of refractive error has been found to vary among children of different caste/ethnic groups and geographical regions. The purpose of this study is to determine the prevalence of refractive error among school children from different caste/ethnic groups in Dadeldhura district of Far West Nepal.
Method This is a cross sectional study of refractive error among secondary school children from 2 schools in Dadeldhura district. All children underwent a vision screening consisting of visual acuity, ocular examination and refraction. Myopia was diagnosed for an eye with spherical equivalent refraction (SER) ≤ -0.5 D whereas an eye with SER ≥ +2.0 D was diagnosed as hyperopic. Ethnicity was reported through self administered questionnaire.
Result Among children aged 12 to 16 years (14.07 ± 1.4) prevalence of myopia was 3.5%, hyperopia 0.33% and astigmatism 1%. All except three children had spherical equivalent refraction (SER) within ±2 D. Caste/ethnicity was not associated significantly with myopia in either eye (χ2= 0.27, df= 2, p= 0.87).
Conclusion The prevalence of refractive error among secondary school children in Dadeldhura district of Far West Nepal is very low in comparison to myopia prevalence reported in studies from other parts of the world, but slightly lower than myopia prevalence found in other, eastern parts of Nepal.
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Belov, D. F., i V. P. Nikolaenko. "Effect of Capsular Tension Ring Implantation during Phacoemulsification on Postoperative Refraction". Ophthalmology in Russia 19, nr 3 (4.10.2022): 489–92. http://dx.doi.org/10.18008/1816-5095-2022-3-489-492.
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Purpose. To assess refractive result of phacoemulsification (PE) with capsular tension ring (CTR) implantation.Patients and methods. In total, 37 eyes of 37 patients who underwent PE with intraocular lens (IOL) implantation were divided into 2 groups: study group (n = 18) with CTR implantation and control group (n = 19) without CTR. Optical biometry (IOL-Master 500) was performed for each patient before PE. Barrett Universal II Formula was used for IOL calculation. IOL power calculation error was assessed by comparing target refraction and final refraction measured by Topcon-8800 autorefractometer 1 month after surgery.Results. Despite almost identical preoperative values in both groups refractive result was different. Patients with CTR implantation had more hyperopic IOL power calculation error of +0.41 ± 0.52 D versus — 0.02 ± 0.54 D in the control group (p = 0.037). Refractive result in control group was more predictable (mean absolute error was 0.55 ± 0.34 D and 0.41 ± 0.30 D for groups respectively, p = 0.180).Conclusion. CTR implantation could help surgeon to perform PE in complicated cases. Nevertheless, CTR implantation could leads to hyperopic shift. To avoid refractive errors optimized A-constants could be used (118.85 for AcrySof SA60AT and 118.47 for Akreos Adapt AO).
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Tufail, Nadia, Huda Abbas, Ali Sarfraz, Sumaira Ashraf i M. Ashraf Majrooh. "Prevalence and Determining Factors Of Refractive Errors Among Medical Students In FMU, Faisalabad". Pakistan Journal of Medical and Health Sciences 15, nr 11 (30.11.2021): 2934–35. http://dx.doi.org/10.53350/pjmhs2115112934.
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Aim: Prevalence and determining factors of refractive errors among the medical students in FMU, Faisalabad. Methodology: Cross-sectional quantitative study conducted in Faisalabad Medical University from 01-03-2020 to 15-12-2020 after approval from institutional review committee. All students of MBBS in FMU were included in this study. A structured questionnaire was used to collect the required quantitative information. SPSS version 26 was used for analysis. Results: Prevalence of refractive error is 49%. Females were 59% and males were 41%. More students i.e. 85.2% were suffering from myopia. In our study, usage of electronic devices i.e. mobile phones especially was one of the risk factors in developing refractive errors. 20.6% students having refractive error said that they use mobile phone for 4 hours, 30.2% having refractive error said that they watch TV for one hour, 23.3% having refractive error said that they play video games for one hour. For the correction of the refractive error, 184 students i.e. 97.4% used spectacles whereas only 5 (2.6%) students used contact lenses. It is observed in this study that contact lenses were only used by those students having refractive error <1.5. Conclusion: Refractive errors were a significant cause of visual impairment among medical students. The prolonged use of electronic devices especially mobile phones should be discouraged. Keywords: Refractive errors, myopia, electronic devices, mobile phone
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Dyatmika, Kadek Dwipa, Nurmawanti Nurmawanti i Rini Kusumawar Dhany. "Relationship between Education, Sex, and Age with Refractive Errors at DR. Wahidin Soedirohusodo General Hospital". Jurnal Ilmiah Kedokteran Wijaya Kusuma 8, nr 1 (17.04.2019): 99. http://dx.doi.org/10.30742/jikw.v8i1.479.
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The prevalence of refractive error and its relationship with education, age and sex at DR. Wahidin Soedirohusodo general hospital have not been comprehensively assessed. The aim of this study was to examined the distribution and risk factor of refractive errors at DR. Wahidin Soedirohusodo general hospital. Methods of this study used population based cross-sectional study. Respondents were interviewed and underwent standardised clinical eye examinations. Refractive error was determined by an automatic refraction device. Refractive errors are myopia, hyperopia and astigmatism. Myopia and hyperopia were defined as spherical equivalent of -0.50/+0.50 diopter (D) or worse, respectively; astigmatism was defined as cylindrical error >0.50 D. Total of 1760 patients with refractive error from January 2016 to January 2018 with 700 or 39,8% males and 1060 or 60.2% females. Based on the cross-tabulation output, it is known that the respondents with the most elementary level of education experienced mild hypermetropy (10.2%), the junior high school education experienced mild myopia (6.8%), high school and bachelor education experienced mild myopia (8%). Age 6-15 years experienced the most myopia compositus astigmatism (5.7%), 16-25 years mild myopia (10.2%), 26-35 years mild myopia (4.5%), 36-45 years mild myopia (10.2%), 46-55 years mild hypermetropia (10.2%) and 56-65 years mild hypermetropia (5.7%). Kruskal Wallis test it is known that the sig value obtained = 0,000 indicates that there are differences in refractive abnormalities based on education and age. Chi square sig value obtained is 0.021, indicating that there is a relationship between sex and refractive errors. Multivariate analysis revealed female subjects inhibited the risk of mild myopic by 0.157 times the male subjects and simple myopia astigmatism by 0.082 times the male subjects. The relationship of myopia, astigmatism and hypermetropia with age and education is not significant. The risk factor of mild myopia and simple myopia astigmatism decrease in female than male. These findings may help clinicians to better understand the patterns of refractive error and planning for preschool vision-screening programs.
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Taylor, R. H., R. B. Ellingham, S. Subramaniam i L. A. Wakely. "Calculating the error in refractive error". Eye 25, nr 10 (22.07.2011): 1333–36. http://dx.doi.org/10.1038/eye.2011.169.
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Gurmizov, Е. P., К. B. Pershin, N. F. Pashinova i А. Iu Tsygankov. "Keratorefractive Surgery for Residual Refractive Error Correction in Pseudophakic Patients". Ophthalmology in Russia 17, nr 2 (23.06.2020): 209–15. http://dx.doi.org/10.18008/1816-5095-2020-2-209-215.
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Purpose. Evaluation of the visual and refractive results of additional correction using LASIK and PRK methods in patients with residual refractive error after previous cataract surgery. Patients and methods. The prospective open study included 57 patients (79 eyes) who previously underwent cataract phacoemulsification (n = 37) or refractive lensectomy (n = 42) with various IOL models implantation (2012–2017). The average age of patients was 50.8 ± 13.9 (19–79) years. Operations LASIK (91.1 %) and PRK (8.9 %) were carried out according to standard methods. In 6 cases, femtosecond laser supported by laser correction. The target refraction ranged from –0.25 to 0.25 D in most (97.5 %) cases. The follow-up period ranged from 6 to 9 months. Results. The patients were divided into groups according to the type of residual refractive error (Group 1 — myopia, group II — emmetropia and group III — hyperopia). Statistically significant differences were determined for the species of previously implanted IOLs — in group II, the frequency of monofocal IOLs was significantly higher (p < 0.05). In group II, the values of the cylindrical component of refraction were significantly higher compared with groups I and III (p < 0.05). In group I, a significant (p < 0.05) decrease in the spherical component of refraction from –1.36 ± 0.92 to –0.2 ± 0.8 D was observed. In patients of group II, there was a slight increase in the spherical component of refraction from 0 ± 0.20 to 0.25 ± 0.29 D (p > 0.05). In group III, a significant (p < 0.05) decrease was observed in the spherical component of refraction from 1.27 ± 0.69 to 0.43 ± 0.49 D. When analyzing the cylindrical component of refraction in group I, its decline was noted from –0.69 ± 0.5 to –0.38 ± 0.46 D (p > 0.05). In group II, the largest decrease in the cylindrical component was observed from –1.6 ± 1.0 to 0.03 ± 1.10 Dptr (p < 0.01). In all the studied groups, a statistically significant (p < 0.05) increase in UCFVA was revealed in the postoperative period. Indicators K1 and K2 did not significantly change. Conclusion. The high efficiency of the correction using the LASIK, PRK and femtoLASIK methods on pseudophakic eyes with the achievement of the target refraction in most of the studied cases was shown. This method can be used as an alternative to spectacle and contact correction in patients with residual refractive error after cataract phacoemulsification and refractive lensectomy with IOL implantation.
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Alghamdi, Waleed. "Prevalence of Refractive Errors among Children in Saudi Arabia: A Systemic Review". Open Ophthalmology Journal 15, nr 1 (24.05.2021): 89–95. http://dx.doi.org/10.2174/1874364102115010089.
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Introduction: The aim of this review was to estimate the prevalence of refractive errors (RE) and uncorrected refractive error (URE) in school-aged children of 4 to 14 years of age in Saudi Arabia. Methods: An extensive search was performed for peer-reviewed studies with data from the Saudi population during the past 20 years. The Cochrane Library, Pubmed, and Embase databases were used. Two independent reviewers evaluated publications and extracted the data. The quality of the studies was evaluated based on a critical appraisal tool designed for systematic reviews. The pooled prevalence of refractive error, uncorrected refractive error and different types of refractive error were estimated by using the random-effects meta-analysis. Results and Discussion: Eight school-based studies were included in this review. Among the overall pooled population of 12,247childern, the estimated prevalence of refractive error was 17.5% (95% CI: 11.1- 25). In the five studies that reported uncorrected refractive error (N=10,198), the pooled prevalence was 16.8% (95% CI: 11.4 – 21.3). The overall prevalence of refractive errors was very similar among boys, 16.8 (95% CI: 10.8- 24.1), and girls, 17.7% (95% CI: 10.2 – 25.9). Myopia was the most prevalent refractive error and was present in 40.8% (95% CI: 16.1 – 69.9) followed by astigmatism 29.7% (95% CI: 6.1- 61.7) and hyperopia 28.3% (95% CI: 16.9 – 41.2). Conclusion: This review highlights the high prevalence of refractive errors and uncorrected refractive error among children in Saudi Arabia. More studies are required using standardised methods in different regions where there is a lack of information on UREs. It is recommended that vision screening programs of children for RE should be implemented at the community level and integrated into school health programmes in order to detect UREs and prevent amblyopia, which is one of the debilitating consequences of URE.
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Ijaz, Hijab. "Relationship between Refractive State and Nutritional Status among the children". Medical Science and Discovery 9, nr 3 (26.03.2022): 175–80. http://dx.doi.org/10.36472/msd.v9i3.701.
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Objective: Refractive error and malnourishment both are common issues in developing countries therefore in this study main aim is to find the relationship between refractive state and nutritional status. Material and Methods: This was a cross-sectional observational study conducted at Tehsil Headquarter Hospital Kamoke. The sample size was 200 children equally divided into well-nourished and malnourished groups with their age range between 3-12 years of both gender. First visual acuity was measured monocularly with Snellen’s Chart The amount and type of refractive error were assessed using cycloplegic refraction with cyclopentolate 1% eye drops. Eyes with amblyopia, strabismus and any other ocular pathology that affects vision were excluded. All children were referred from eye department to the nutritionist of this hospital to determine the nutritional status through WHO provided guidelines. Results: There were a total of 101 (50.5%) males and 99 (49.5%) females in this study. The most common type of refractive error was Astigmatism which was present in 29 (29%) well-nourished and 31 (31%) malnourished children. The least common was hypermetropia which was present in only 3 children and all were females. However, myopia was present in 12 (12%) well-nourished and 11 (11%) malnourished children. Conclusion: Thus, Refractive errors were present in both groups. The most common was Astigmatism and the least common was hypermetropia in both groups. The inferential statistics of this study concluded that refractive errors were not related with nutritional status but may be due to some factors.
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Betiku, Anthony O., Adeola O. Onakoya, Olufisayo T. Aribaba i Omodele O. Jagun. "Relationship between axial length, keratometry and central corneal thickness in patients with refractive errors at a teaching hospital in Southwest, Nigeria". International Journal of Advances in Medicine 8, nr 11 (26.10.2021): 1657. http://dx.doi.org/10.18203/2349-3933.ijam20214128.
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Background: Aim of the study was to determine the relationship between axial length (AL), keratometry and central corneal thickness (CCT), and refractive errors in adult patients attending the Guinness eye centre (GEC), Lagos university teaching hospital (LUTH) Idi-Araba, Lagos.Methods: A descriptive cross-sectional study conducted among consecutive patients aged 16 years and above with refractive errors attending the GEC, LUTH. Ocular parameters measured included AL, anterior corneal curvature, CCT and refractive errors. AL and keratometry were measured with IOL master and CCT with ultrasonic A scan pachymeter. Refraction was done with auto-refractor-keratometer. Data analysis was done with statistical package for social science (SPSS) 20. Results: A total of 394 patients were studied, 157 males and 237 females. The age range was 16-65 years, mean -37.9±13.3 years and median -36.5 years. There were more myopic patients 215 (54.6%) than hyper-metropes 179 (45.4%). The mean AL was 23.9±1.1 mm and eyes with longer AL were more likely to be myopic (r=-0.676, p<0.001); to have flatter cornea (r=0.519, p<0.001) and thicker cornea (r=0.149, p=0.003). The mean CCT was 520.3±31.0 µm. There was a weak negative correlation between CCT and refractive error (r=-0.111, p=0.027).Conclusions: The mean CCT was lower than the mean CCT of other Nigerian studies. Hypermetropic patients were more likely to have thinner corneas. This may lead to underestimation of intraocular pressure (IOP) in these patients. Significant correlation was seen between AL and refractive error, CCT and keratometry. AL correlated with less spherical equivalent refractive error, flatter and thicker cornea. It is therefore important to measure the CCT of all patients going for refractive surgery to detect those at risk of developing corneal ectasia following refractive surgery.
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Hardiyanti, Disti, i Fatimah Dyah NA. "Correlation between Autorefractometry and Retinoscopy with Subjective Refraction in Refractive Error Patients at Dr Kariadi Hospital, Semarang". Ophthalmologica Indonesiana 47, nr 2 (30.08.2021): 46–51. http://dx.doi.org/10.35749/journal.v47i2.100302.
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Objective: Refractive errors are a major cause of visual impairment in Indonesia. In Dr. Kariadi Hospital Semarang, it is amongst the top five diagnoses within the ophthalmology department. Therefore, objective refraction is imperative for the management of refractive errors. These examinations include autorefractometry and retinoscopy. Despite the fact that retinoscopy is the gold standard, autorefractometry is more desirable as it is more sophisticated, swift, and convenient. Autorefractometry's results are expected to match results from subjective correction, therefore, reduce examination time as patient visits increase. This study aims to determine the correlation between autorefractometry and retinoscopy examination with subjective refraction.
Methods: The study design was cross-sectional. The study was conducted on 34 eyes with refractive error taken by consecutive sampling. The subjects had to meet inclusion and exclusion criteria. All subjects underwent visual acuity examination, refractive correction by autorefractometry, retinoscopy, and subjective refraction. All data were processed by using computerized formulations.
Results: Based on the demographics there were 61.8% of women and 38.2% of men with an average age of 29.7 + 9. The results of this study showed a strong correlation between autorefractometry and subjective refraction. Furthermore, retinoscopy shows a strong correlation with subjective refraction as well.
Conclusion: This study shows retinoscopy is superior to autorefractometry. However, autorefractometry is a viable replacement for patients in Dr. Kariadi Hospital Semarang.
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Kulikov, Alexey N., Sergey V. Churashov i Vladimir A. Reytuzov. "Molecular genetic aspects of complicated myopia pathogenesis". Ophthalmology journal 11, nr 3 (2.12.2018): 48–56. http://dx.doi.org/10.17816/ov11348-56.
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Complicated myopia (CM) is not only a refractive error but a complex, multifactorial disorder characterized by a mismatch between the optical power of the eye and the axial length that causes the image to be focused off the retina. Genetic factors in progressive myopia play a key role in determining the impact of ecologic factors on refraction development. The majority of genetic variants underlying CM are characterized by modest effect and/or low frequency, which makes them difficult to identify using classic genetic approaches. The genes identified to date account for less than 10% of all myopia cases, suggesting the existence of a large number of yet unidentified low-frequency and/or small-effect variants, which underlie the majority of myopia cases. Genome analysis revealed dozens of loci associated with non-syndromic myopia, and showed that refractive errors are associated with mutations in genes that are involved in the growth and development of the eye by regulating ion transport, neurotransmission, remodeling of extracellular matrix of the retina and other ocular structures. Genetic study of refractive error provides a unique opportunity to detect key molecules that may play important roles in the development of refractive error. Identifying the molecular basis of refractive error helps to understand mechanisms, and subsequently to design rational therapeutic intervention for this condition.
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Megala, M., S. Dhamodharan, M. Duraimurugan i K. Chellavel Ganapathi. "A study on prevalence of refractive error and its associated factors among school children in Tamil Nadu". International Journal Of Community Medicine And Public Health 7, nr 5 (24.04.2020): 1880. http://dx.doi.org/10.18203/2394-6040.ijcmph20201999.
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Background: Refractive error is an avoidable cause of visual impairment. Children do not complain of defective vision. This warrants early detection and treatment. The study was conducted with the objective of estimating the prevalence of refractive error in school children and its associated factors.Methods: This was a cross sectional study conducted in schools of selected district in Tamil Nadu from July 2017 to January 2018. Sample size of 422 covered. A semi structured questionnaire was used to collect the details and also screened for refractive errors. Data was analysed using SPSS.Results: Among the 422 students screened, 86 (20.4%) had refractive error. The prevalence of refractive error showed significant association with age, education and occupation of parents, socio economic status, parental history of refractive error, duration of watching television and body mass index.Conclusions: Refractive errors among school children can be easily identified by regular eye screening programmes, promptly treated can be protected from future complications. Periodic screening of school children is very essential to improve the quality of eye-sight.
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Albarrán-Diego, César, Gonzalo Muñoz, Teresa Ferrer-Blasco i Santiago García-Lázaro. "Prevention of Hyperopic Surprise after LASIK in Patients with Refractive Multifocal Intraocular Lenses". European Journal of Ophthalmology 21, nr 6 (6.07.2011): 826–29. http://dx.doi.org/10.5301/ejo.5000005.
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Purpose. Three cases of patients who developed a similar hyperopic defect in refraction following laser in situ keratomileusis (LASIK) after multifocal intraocular lens (IOL) implantation are described. Methods. Ophthalmologic evaluation including refractive status, corrected and uncorrected visual acuity (both at far and near), and corneal topography in patients presenting similar hyperopic refractive surprise in one eye as a result of LASIK refinement of residual ametropia after refractive multifocal IOL implantation. Results. Laser in situ keratomileusis enhancement for residual ametropia of −1.00 to −1.50 D in patients with a prior implantation of refractive multifocal IOL resulted in a refractive surprise of +2.25 to +2.50 D. After excluding other possible sources of error, an explanation for such a refractive surprise is suggested, and a simple method for avoiding this error is presented. Conclusions. Proper knowledge of the defocus curve and the use of a systematic method for determining subjective refraction in patients implanted with refractive multifocal IOLs will reduce the possibility of refractive surprise after LASIK enhancement in a bioptics procedure.
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Maqbool, Saadia, Abdul Rehman Rizwan, Iram Manzoor, Ali Qais, Aleena Furqan i Abdul Rehman. "Prevalence of Refractive Errors among Medical Students and Identification of Associated Factors". Life and Science 2, nr 4 (28.09.2021): 5. http://dx.doi.org/10.37185/lns.1.1.184.
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Objective: To determine the prevalence of refractive errors among medical students and identify associatedfactors.Study Design: Analytical, cross-sectional study.Place and Duration of Study: The study was conducted in the Department of Community Medicine at AkhtarSaeed Medical and Dental College, Lahore from September 2020 to December 2020.Materials and Methods: The study included 300 medical students using convenience sampling technique. Aself- structured pre- tested questionnaire was used. All medical students including MBBS, BDS, Pharm –D andallied health sciences were included in the study. Those students who did not give consent were excluded fromthe study. Data analysis was done with SPSS version 23. Chi square test of significance was applied to findassociation between the variables and p-value < 0.05 was considered statistically significant.Results: Refractive error was observed in 203 students (67.7%). The commonest refractive error was myopia(37%) followed by hypermetropia (23.7%) and astigmatism (7%). The prevalence of refractive errors wassignificantly associated with positive family history (p value=<.001), family income per month (p value=0.01)and mobile use per day (p value=0.001). Higher percentage of refractive error (70.6%) was reported byparticipants who were comfortable with light in which they study (p value=0.03).Conclusion: The prevalence of refractive error was 67.7% among medical students, and myopia was the mostprevalent refractive error. Refractive errors were significantly associated with positive family history, familyincome and mobile use per day.
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Dr. N. Prema, Dr N. Prema. "Recuperating Capabilities of students after Refractive Error correction". Indian Journal of Applied Research 3, nr 8 (1.10.2011): 175–76. http://dx.doi.org/10.15373/2249555x/aug2013/58.
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Rodge, Hina Y., i Shalini Lokhande. "Refractive Error in Children". International Journal of Current Research and Review 12, nr 23 (2020): 185–88. http://dx.doi.org/10.31782/ijcrr.2020.122307.
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Wittenberg, Sidney. "Control of refractive error". Current Opinion in Ophthalmology 1, nr 1 (luty 1990): 69–71. http://dx.doi.org/10.1097/00055735-199002000-00015.
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Arnold, Robert W., i Andrew W. Arnold. "Refractive Error in Myanmar". Ophthalmology 115, nr 9 (wrzesień 2008): 1642–43. http://dx.doi.org/10.1016/j.ophtha.2008.05.018.
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Jonas, Jost B., Yong Tao, Michael Neumaier i Peter Findeisen. "VEGF and Refractive Error". Ophthalmology 117, nr 11 (listopad 2010): 2234–2234. http://dx.doi.org/10.1016/j.ophtha.2009.12.006.
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Arnold, Robert W. "Prevalence of Refractive Error". Ophthalmology 117, nr 8 (sierpień 2010): 1652. http://dx.doi.org/10.1016/j.ophtha.2010.03.069.
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Grødum, Kirsti, Anders Heijl i Bo Bengtsson. "Refractive error and glaucoma". Acta Ophthalmologica Scandinavica 79, nr 6 (grudzień 2001): 560–66. http://dx.doi.org/10.1034/j.1600-0420.2001.790603.x.
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Milder, Ben. "The dread refractive error". Survey of Ophthalmology 37, nr 6 (maj 1993): 466. http://dx.doi.org/10.1016/0039-6257(93)90147-y.
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Harb, Elise N., i Christine F. Wildsoet. "Origins of Refractive Errors: Environmental and Genetic Factors". Annual Review of Vision Science 5, nr 1 (15.09.2019): 47–72. http://dx.doi.org/10.1146/annurev-vision-091718-015027.
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Refractive errors are the product of a mismatch between the axial length of the eye and its optical power, creating blurred vision. Uncorrected refractive errors are the second leading cause of worldwide blindness. One refractive error currently attracting significant scientific interest is myopia, mostly owing to the recent rise in its prevalence worldwide and associated ocular disease burden. This increase in myopia prevalence has also been rapid, suggesting environmental influences in addition to any genetic influences on eye growth. This review defines refractive errors, describes their prevalence, and presents evidence for the influence of genetic and environmental factors related to refractive error development.
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Moore, Michael, James Loughman, John S. Butler, Arne Ohlendorf, Siegfried Wahl i Daniel I. Flitcroft. "Application of big-data for epidemiological studies of refractive error". PLOS ONE 16, nr 4 (23.04.2021): e0250468. http://dx.doi.org/10.1371/journal.pone.0250468.
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Purpose To examine whether data sourced from electronic medical records (EMR) and a large industrial spectacle lens manufacturing database can estimate refractive error distribution within large populations as an alternative to typical population surveys of refractive error. Subjects A total of 555,528 patient visits from 28 Irish primary care optometry practices between the years 1980 and 2019 and 141,547,436 spectacle lens sales records from an international European lens manufacturer between the years 1998 and 2016. Methods Anonymized EMR data included demographic, refractive and visual acuity values. Anonymized spectacle lens data included refractive data. Spectacle lens data was separated into lenses containing an addition (ADD) and those without an addition (SV). The proportions of refractive errors from the EMR data and ADD lenses were compared to published results from the European Eye Epidemiology (E3) Consortium and the Gutenberg Health Study (GHS). Results Age and gender matched proportions of refractive error were comparable in the E3 data and the EMR data, with no significant difference in the overall refractive error distribution (χ2 = 527, p = 0.29, DoF = 510). EMR data provided a closer match to the E3 refractive error distribution by age than the ADD lens data. The ADD lens data, however, provided a closer approximation to the E3 data for total myopia prevalence than the GHS data, up to age 64. Conclusions The prevalence of refractive error within a population can be estimated using EMR data in the absence of population surveys. Industry derived sales data can also provide insights on the epidemiology of refractive errors in a population over certain age ranges. EMR and industrial data may therefore provide a fast and cost-effective surrogate measure of refractive error distribution that can be used for future health service planning purposes.
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Triveni, Dr Chimata, Dr Tirumuru Divya, Dr Ponna Rama Devi, Dr N. Lakshmi Chowdary i Dr Gantela Sirisha. "Prevalence Of Refractive Errors In School Going Children In Rural And Urban Areas -A Cross-Sectional Study". Tropical Journal of Ophthalmology and Otolaryngology 6, nr 2 (23.04.2021): 22–27. http://dx.doi.org/10.17511/jooo.2021.i02.01.
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Introduction: Visual impairment affects students’ routine schoolwork and day-to-day activities.Hence, the aim is to study the prevalence of various refractive errors and their comparison amongschool children of 5-15 years in rural and urban areas. Methods: This cross-sectional studyexamined 998 students from both rural and urban schools. After obtaining ethical clearance andinformed consent, students were examined for refractive errors. The students with the refractiveerror were given a socio-demographic questionnaire and questionnaire regarding their usage oftelevision, computer, and family history of refractive errors. A Chi-square test was used to test thestatistical significance of proportions. P-value < 0.05 was considered statistically significant, anddata were analyzed by using coGuide software, V.1.03 Results: The prevalence of refractive errorwas found to be 6.41 %, with a prevalence of 7.61% in urban and 5.21% in rural areas. Thedifference in the type of refractive error between the study groups was found to be insignificant,with P= 0.897. Conclusion: Prevalence of refractive errors was more in urban school children thanrural. Refractive error was more prevalent in 13-15 years age group in both rural and urban schoolchildren. The most common refractive error was myopia, followed by astigmatism andhypermetropia.
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Kumar, Rajesh S., Caitlin A. Moe, Deepak Kumar, Mahalakshmi V. Rackenchath, Sathi Devi A. V., Sriharsha Nagaraj, Dionna M. Wittberg, Robert L. Stamper i Jeremy D. Keenan. "Accuracy of autorefraction in an adult Indian population". PLOS ONE 16, nr 5 (19.05.2021): e0251583. http://dx.doi.org/10.1371/journal.pone.0251583.
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Purpose Autorefractors allow non-specialists to quickly assess refractive error, and thus could be a useful component of large-scale vision screening programs. In order to better characterize the role of autorefraction for public health outreach programs in resource-limited settings, the diagnostic accuracy of two autorefractors was assessed relative to subjective refraction in an adult Indian population. Methods An optometrist refracted a series of patients aged ≥50 years at an eye clinic in Bangalore, India using the Nidek ARK-900 autorefractor first, followed by the 3nethra Royal autorefractor, and then subjective refraction. The diagnostic accuracy of each autorefractor for myopia, hyperopia, and astigmatism was assessed using subjective refraction as the reference standard, and measures of agreement between refractions were calculated. Results A total of 197 eyes in 104 individuals (mean age 63 ± 8 years, 52% female) were evaluated. Both autorefractors produced spherical equivalent estimates that were on average more hyperopic than subjective refraction, with a measurement bias of +0.16 D (95%CI +0.09 to +0.23D) for Nidek and +0.42 D (95%CI +0.28 to +0.54D) for 3nethra. When comparing pairs of measurements from autorefraction and subjective refraction, the limits of agreement were approximately ±1D for the Nidek autorefractor and ±1.75D for the 3Nethra autorefractor. The sensitivity and specificity of detecting ≥1 diopter of myopia were 94.6% (95%CI 86.8–100%) and 92.5% (95%CI 88.9–97.5%) for the Nidek, and 89.2% (95%CI 66.7–97.4) and 77.5% (95%CI 71.2–99.4%) for the 3Nethra. The accuracy of each autorefractor increased at greater levels of refractive error. Conclusions The sensitivity and specificity of the Nidek autorefractor for diagnosing refractive error among adults ≥50 years in an urban Indian clinic was sufficient for screening for visually significant refractive errors, although the relatively wide limits of agreement suggest that subjective refinement of the eyeglasses prescription would still be necessary.
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Rai, Salma K. C., Hari Bahadur Thapa, Nanda Gurung, Arjun Malla Bhari i Manoj K. Sharma. "Pattern of Refractive Error in Primary School Children in Rupandehi District, Nepal". Journal of Universal College of Medical Sciences 3, nr 1 (3.09.2015): 31–36. http://dx.doi.org/10.3126/jucms.v3i1.13256.
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INTRODUCTION: Refractive error remains one of the primary causes of visual impairment in children worldwide. This study describes pattern of refractive errors among primary school students in Rupandehi district, Nepal.MATERIAL AND METHODS: Records of 128 children with refractive error aged 5-15 years from both urban and rural areas in Nepal between January and March 2011 were examined for patterns in the distribution of refractive errors. SPSS statistical software was used to perform analysis.RESULTS: The commonest type of refractive errors among the children was astigmatism (47%) followed by myopia (26%) and hyperopia (19%). Children in the age group 11-15 years had higher number of eyes with refractive error as compared to their younger counterparts 5 years /or below 5 years (49% vs. 9%). 71% students were from schools located in rural areas. Among the children with refractive errors, only 44.5% students were wearing glasses. 57% of the students studying in private schools were wearing glasses but only 26.9% students from the government school were wearing glasses.CONCLUSION: A wide variation in the distribution of refractive errors between the geographic locations, gender basis, types of schools as well as between the different ethnic groups was observed.Journal of Universal College of Medical Sciences Vol. 3, No. 1, 2015: 31-36
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Wisse, Robert P. L., Marc B. Muijzer, Francesco Cassano, Daniel A. Godefrooij, Yves F. D. M. Prevoo i Nienke Soeters. "Validation of an Independent Web-Based Tool for Measuring Visual Acuity and Refractive Error (the Manifest versus Online Refractive Evaluation Trial): Prospective Open-Label Noninferiority Clinical Trial." Journal of Medical Internet Research 21, nr 11 (8.11.2019): e14808. http://dx.doi.org/10.2196/14808.
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Background Digital tools provide a unique opportunity to increase access to eye care. We developed a Web-based test that measures visual acuity and both spherical and cylindrical refractive errors. This test is Conformité Européenne marked and available on the Easee website. The purpose of this study was to compare the efficacy of this Web-based tool with traditional subjective manifest refraction in a prospective open-label noninferiority clinical trial. Objective The aim of this study was to evaluate the outcome of a Web-based refraction compared with a manifest refraction (golden standard). Methods Healthy volunteers from 18 to 40 years of age, with a refraction error between –6 and +4 diopter (D), were eligible. Each participant performed the Web-based test, and the reference test was performed by an optometrist. An absolute difference in refractive error of <0.5 D was considered noninferior. Reliability was assessed by using an intraclass correlation coefficient (ICC). Both uncorrected and corrected visual acuity were measured. Results A total of 200 eyes in 100 healthy volunteers were examined. The Web-based assessment of refractive error had excellent correlation with the reference test (ICC=0.92) and was considered noninferior to the reference test. Uncorrected visual acuity was similar with the Web-based test and the reference test (P=.21). Visual acuity was significantly improved using the prescription obtained by using the Web-based tool (P<.01). The Web-based test provided the best results in participants with mild myopia (ie, <3 D), with a mean difference of 0.02 (SD 0.49) D (P=.48) and yielding a corrected visual acuity of >1.0 in 90% (n=77) of participants. Conclusions Our results indicate that Web-based eye testing is a valid and safe method for measuring visual acuity and refractive error in healthy eyes, particularly for mild myopia. This tool can be used for screening purposes, and it is an easily accessible alternative to the subjective manifest refraction test. Trial Registration Clinicaltrials.gov NCT03313921; https://clinicaltrials.gov/ct2/show/NCT03313921.
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Sukumaran, Kajal Seema, Jayalekshmi Thankamma, Prasenna Meleaveetil i Kavitha Syamala. "Is Prematurity a Risk Factor for Refractive Errors in Children? Results from School Vision Screening Program". Journal of Evidence Based Medicine and Healthcare 7, nr 42 (19.10.2020): 2380–83. http://dx.doi.org/10.18410/jebmh/2020/493.
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BACKGROUND The prevalence of refractive errors is reported to be higher in children born preterm. Factors like gestational age, birth weight and retinopathy of prematurity status have a significant impact on the refractive development in preterm infants. Population based long term follow up studies on the refractive status in preterm infants are limited. We designed this study to assess whether prematurity is a risk factor for refractive errors in children. METHODS This study was conducted among children aged 5 - 16 years who participated in the school vision screening program over a period of one year. All children underwent detailed ocular examination including measurement of best corrected visual acuity, cycloplegic refraction and fundoscopy. Visual acuity was assessed using an internally illuminated Snellen’s chart at 6 meters. Objective refraction by streak retinoscopy after instilling 1 % cyclopentolate eye drops was done in all children with visual acuity ≤ 6 / 9. Children were divided into two groups based on their gestational age at birth - preterm group and full-term group. Preterm birth was defined as childbirth before 37 completed weeks of gestation. Children were enrolled in the study only if the hospital birth document showing gestational age and birth weight was available. Children with co-existing organic disease affecting the eye contributing to the diminished visual acuity such as congenital cataract, glaucoma, and corneal opacities were excluded from the study. Those who had undergone any ocular surgery were also excluded. RESULTS One thousand two hundred and ninety-five children were enrolled in the study of which 700 (54.1 %) were boys and 595 (45.9 %) were girls. Median age of the enrolled children was 12 years. The number of pre-term births was 287 (22.2 %). Of the 1295 students screened, 273 (21 %) had refractive errors. Among the children with refractive errors, astigmatism was the most common refractive error (10.6 %), followed by myopia (8.5 %) and hypermetropia (1.9 %). Refractive errors were statistically more prevalent in preterm group (34.1 %), when compared with term born children (17.3 %), p = < 0.001. Compared to the term born children, preterm group had significantly higher prevalence of myopia; 16.4 % vs 6.3 % (p = < 0.001) and astigmatism; 15.3 % vs 9.3% (p = 0.003). There was no statistically significant difference in the prevalence of hypermetropia among the two groups; 2.4 vs. 1.8 (p = 0.477). CONCLUSIONS There is strong association between prematurity and refractive errors. These findings prompt long term monitoring of the refractive and visual outcome in preterm infants for diagnosing refractive errors at the earliest. This helps to prevent the consequent amblyopia and the ensuing permanent visual function deficits. KEYWORDS Prematurity, Refractive Error, Myopia, Hypermetropia, Astigmatism