Dissertations / Theses on the topic 'Refractive error'
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Smith, Kyla M. "Field measures of refractive error /." Adobe Acrobat Reader required to view document, 2008. http://library.neco.edu/theses/SmithThesisMay08.pdf.
Full textNg, Siu-chun Danny, and 吳兆駿. "The prevalence of refractive error and visual impairment caused by uncorrected refractive error in China." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B4804331X.
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Public Health
Master
Master of Public Health
Marks, Amanda R. "Nutrition, Vitamin D and Refractive Error." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275397144.
Full textHartwig, Andreas. "The influence of optics, peripheral refraction and posture on refractive error development." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/the-influence-of-optics-peripheral-refraction-and-posture-on-refractive-error-development(f0382767-3194-4631-8cab-d473d64900bd).html.
Full textShah, Rupal Lalit. "Discovery of genetic determinants for refractive error." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/114602/.
Full textGraham, Nicholas Dale. "The Heritability of Refractive Error between Siblings." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275350173.
Full textSmith, Molly J. "Peripheral Refractive Error in Multifocal Contact Lenses." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460470062.
Full textMcBrien, N. A. "The relationship between accommodation responses and refractive error." Thesis, Cardiff University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376826.
Full textMerchea, Mohinder Mohan. "Refractive error shift with continuous use (Rescu) lenses." Connect to this title online, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1054652868.
Full textTitle from first page of PDF file. Document formatted into pages; contains xv, 144 p.; also includes graphics (some col.) Includes bibliographical references (p. 129-144). Available online via OhioLINK's ETD Center
Kearney, Stephanie. "Myopia : the association between environmental factors and refractive error." Thesis, Ulster University, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.725340.
Full textO'Donoghue, Elizabeth Ann. "Epidemiology of refractive error in a United Kingdom Child Population." Thesis, University of Ulster, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529548.
Full textBreslin, Karen Margaret Mary. "A prospective study of refractive error amongst Northern Irish schoolchildren." Thesis, University of Ulster, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.587479.
Full textSharma, Abhishek. "Xichang paediatric refractive error study (X-PRES), A pilot study." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510222.
Full textAndersen, Courtney Erin. "Validation and Repeatability of Pediatric Refractive Error Profile 2 (PREP2)." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1363117173.
Full textMulvihill, Shane. "Light Exposure, Refractive Error, and Red and Blue Light-Driven Pupillary Responses." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460742215.
Full textStewart-Bates, Emma. "Proportion of Myopia among Youth Athletes across Different Sports and Locations." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595454796826532.
Full textLehman, Joseph Christian. "Sphero-cylindrical Refraction with Spherical Lenses." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587510615809807.
Full textParkinson, Annette. "Ocular biometric change in orthokeratology : an investigation into the effects of orthokeratology on ocular biometry and refractive error in an adult population." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/6328.
Full textBeverage, Jacob Lee. "Measuring refractive error in the human eye using a Shack-Hartmann-based autorefractor." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/298729.
Full textSaigal, Richa. "The role of altered ciliary muscle morphology in refractive error and accommodative function." Thesis, Aston University, 2016. http://publications.aston.ac.uk/30076/.
Full textBeckett, David Beckett. "The Effect of Light Exposure and Refractive Error on Post-Illumination Pupil Responses." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu152347133666468.
Full textOrr, Janis B. "Optical and biometric characteristics of the eye and their relationship to refractive error." Thesis, Glasgow Caledonian University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601635.
Full textSchultz, Kristin E. "Accommodative microfluctuations, crystalline lens tension, ciliary body thickness, and refractive error in children." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1240445960.
Full textErnst, Lauren E. "Ciliary Body Thickness and the Relationship to Refractive Error and Accommodative Function in Adults." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1271097119.
Full textScher, Aaron David. "Microstrip post production tuning bar error and compact resonators using negative refractive index metamaterials." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2337.
Full textOrr, Danielle Jean. "The Effect of Refractive Error and Light Exposure on Red and Blue Light-Driven Pupil Responses." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1491935483251647.
Full textArmstrong, Deborah. "The Role of vision and refractive correction changes in dizziness." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/16956.
Full textCollege of Optometrists sponsored the research with a Postgraduate Research Scholarship
Locke, Christina. "In vivo cone photoreceptor imaging in adolescents as a measure of retinal stretch during refractive error development." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1554723728663165.
Full textMorgan, Kelly M. "The Effect of Refractive Error and Time Spent Outdoors on Red and Blue Light-Driven Pupil Responses." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555351799339715.
Full textBarsha. "Optical coherence tomography angiography assessment of retinal and choroidal vasculature: Diurnal and longitudinal changes and refractive error." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/236553/1/Barsha%2BThesis%281%29.pdf.
Full textCoates, Zachary Alan. "Contact Lens, Academics, and Self-Perception (CLASP) Study: Study Design and Initial Results." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1554753474788361.
Full textAkuta, Godwin Chukwuemeka. "Prevalence of refractive errors among primary school children (7-14 years) in Motherwell Township, Eastern Cape, South Africa." Thesis, University of Limpopo, 2015. http://hdl.handle.net/10386/1751.
Full textBackground: Uncorrected refractive errors remain a public health problem among different population and age groups worldwide, including South Africa. Refractive error has serious visual and functional impacts on those affected. In children, refractive errors may negatively affect the academic pursuits and activities of daily living such as reading. Aims and Objectives: To determine and document the prevalence, types and magnitude together with age and gender differences of refractive errors among primary school children in Motherwell Township, Eastern Cape Province, South Africa. Methods: This was a quantitative, cross sectional refractive error study. Four hundred and twenty one (421) school children aged 7 – 14 years were randomly selected from five randomly selected schools in Motherwell Township, Eastern Cape Province, South Africa. Visual examination which included unaided and aided visual acuity (with LogMAR E chart), non-cycloplegic autorefraction, subjective refraction, internal and external examination of the eye using an ophthalmoscope was conducted. Refractive errors were measured with an autorefractor, refined subjectively and findings presented in spherical form. Hyperopia was defined as a spherical equivalent (SE) of +0.50 D or greater, myopia as spherical equivalent of -0.50 D or greater. A cylindrical power of -0.50 DC (D cylinder) or greater was considered as astigmatism. Results: The prevalence of hyperopia, myopia and astigmatism among the children were 25.2%, 18.7% and 58.0% respectively. Hyperopia ranged from +0.50 to +3.62 D and myopia ranged from -0.50 D to -20.25 D in the right eyes with a mean of -0.17 ± 1.7 D. In the left eye, hyperopia ranged from +0.50 to +2.62 D and myopia ranged from -0.50 to -20.62 D with a mean of -0.12 ± 1.7 D. Astigmatism in the right eyes ranged from -0.50 to -5.50 D with a mean of -0.6 ± 0.52 D and in the left eye ranged from -0.50 to -4.00 D with a mean of -0.6 ± 0.45 D respectively. Association between hyperopia and age was not statistically significant (p = 0.839), also refractive error and gender was statistically insignificant (p = 0.120). Against-the-rule (ATRA) astigmatism (43.4%) was more common, followed by with-the-rule (WTRA) astigmatism (39.0%) and oblique, (all other meridians) (17.6%). There was a significant association between types of astigmatism and age (p = 0.05), more so inter-gender difference in the prevalence of different types of astigmatism was not statistically significant (p = 0.774). Conclusion: The study concludes that refractive error has high prevalence of 43.9% in this children population. Astigmatism (58.0%) was more common followed by hyperopia (25.2%) v and myopia (18.7%). Although hyperopia was not age dependent, there was obvious relationship pattern between female genders and hyperopia in the present study. Population-based vision screening or at least school visual screening in the rural communities of Motherwell Township is, therefore recommended. Vision screening and proper eye examination with appropriate optical compensation will improve the activity of daily living and quality of life of those affected. Key words: Refractive error, hyperopia, myopia, astigmatism, school children
Abraham, Opare. "School Vision Screening Programs In Reducingchildren With Uncorrected Refractive Error In Low And Middle-income Countries (Lmic)(Systematic Review)." Master's thesis, Faculty of Health Sciences, 2019. http://hdl.handle.net/11427/31171.
Full textYoshikawa, Munemitsu. "Comprehensive Replication of the Relationship Between Myopia-Related Genes and Refractive Errors in a Large Japanese Cohort." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225503.
Full textYi, Fan, and n/a. "Optimal Algorithmic Techniques of LASIK Procedures." Griffith University. School of Engineering, 2006. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20070216.152339.
Full textHassert, Jennifer C. "Gaining Focus: Using RNAi during Lens Development to Understand Emmetropization Mechanisms Found within the Diving Beetle Larvae Thermonectus Marmoratus." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin156387276836344.
Full textYi, Fan. "Optimal Algorithmic Techniques of LASIK Procedures." Thesis, Griffith University, 2006. http://hdl.handle.net/10072/368097.
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Master of Philosophy (MPhil)
School of Engineering
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Jorge, Francisco Vieira. "Avaliação do erro refrativo em cães pseudofáquicos, afáquicos e fáquicos com recurso a retinoscopia de luz em fenda." Master's thesis, Universidade de Lisboa, Faculdade de Medicina Veterinária, 2017. http://hdl.handle.net/10400.5/14335.
Full textA ametropia é uma das causas de diminuição da acuidade visual, podendo comprometer grandemente a visão de um cão. Neste estudo pretende-se avaliar o erro refrativo em cães submetidos a cirurgia de cataratas por facoemulsificação com implante de lente intraocular, a eficácia do poder dióptrico usado das lentes intraoculares usadas atualmente, estabelecer uma correlação entre cães microftálmicos e os seus valores refrativos e em paralelo avaliar o estado refrativo de uma população de cães saudáveis que constituem o grupo controlo. Uma população de 53 cães, perfazendo um total de 99 retinoscopias, foi dividida em 3 grupos: pseudofáquicos (n=43 olhos), afáquicos (n=4 olhos) e fáquicos (n=52) correspondendo ao grupo controlo. As retinoscopias foram feitas através da refração dos meridianos vertical e horizontal; os meridianos oblíquos apenas foram avaliados na presença de reflexos em tesoura. Não foram usados quaisquer fármacos cicloplégicos. O estado refrativo médio foi de +3.74 +/-5.45D (-3.5; +21D) no grupo dos pseudofáquicos; +16.94 +/-1.39D (+15.5;+18.25D) nos afáquicos e -0.03 +/-1.64D (-5.0;+4D) nos fáquicos. No grupo dos pseudofáquicos 72.2% apresentaram hipermetropia e 13.8% miopia e emetropia. Foi diagnosticado astigmatismo em 3 olhos. Observou-se anisometropia em 10 cães (1;20.5D) e antimetropia em dois. A correlação entre o valor refratado e o comprimento axial sugere uma tendência para a emetropia em animais com diâmetro ocular superior (P= 0.0845; rho=-0.3). No grupo fáquico, 44% apresentaram-se emétropes, 30% hipermétropes e 26% míopes. A hipermetropia baixa foi predominante nos cães hipermétropes (66.7%). Não foram observados casos de astigmatismo ou anisometropia. Foi encontrada uma relação entre o estado refrativo e o tamanho da raça no grupo fáquico (P=0.002). A análise de correlação entre o valor refratado e a idade dos cães sugere a tendência para a miopia ou diminuição de valores de hipermetropia em cães mais velhos (P = 0.054; rho = -0.273). As raças médias demonstraram estar mais próximas da emetropia quando comparadas com raças grandes e pequenas (P=0.002). No grupo operado, as raças grandes estavam mais adaptadas a IOLs de 41D, enquanto as raças médias e pequenas apresentaram grande variabilidade no estado refrativo. Os cães microftálmicos operados apresentaram alta hipermetropia. Mais estudos devem ser conduzidos para relacionar caraterísticas biométricas individuais com o poder dióptrico necessário, levando assim a uma oferta mais alargada de IOLs em cães.
ABSTRACT - Ametropia is a possible cause for diminished visual acuity in dogs and may lead to a severe compromise of their vision. In this study under this master thesis, we aimed to evaluate the refractive error in dogs with IOL implants, the efficacy of the dioptric power used in nowadays IOL implants, attempt to establish a correlation between microphthalmic dogs and refractive values and in parallel to evaluate the refractive state on a healthy control population of dogs. A population of 53 dogs, corresponding to a total of 99 retinoscopies, was divided in 3 groups: pseudophakic (n=43 eyes), aphakic (n=4 eyes) and a phakic healthy control group (n=52 eyes). Streak retinoscopy was performed by horizontal and vertical refraction. Oblique meridians were refracted only when swirling or scissor like reflexes were observed. No cycloplegic drugs were administered. Mean refractive state in the different groups corresponded to: pseudophakics +3.74 +/-5.45D (-3.5; +21D); aphakics +16.94 +/-1.39D (+15.5;+18.25D) and phakic group -0.03 +/-1.64D (-5.0;+4D). On the pseudophakic group 72.2% were hyperopic, 13.8% myopic and emmetrope. Astigmatism was diagnosed in 3 eyes. Anisometropia was observed in 10 patients (1; 20.5D) and antimetropia in 2. Correlation between refractive values and optic axial length suggested a tendency towards emmetropia in animals with higher ocular diameter (P= 0.0845; rho=-0.3). On the phakic group 44% were emmetrope, 30% hyperopic and 26% myopic. Low hyperopia predominated on hyperopic eyes (66.7%). No cases of astigmatism or anisometropia were registered. An association between refractive state and animal size was found in phakic dogs (P=0.002). Correlation analysis between retinoscopy values and age suggested a tendency towards lower hyperopic values or myopia in older animals (P = 0.054; rho = -0.273). Medium size breeds were closer to emmetropia than small/ large breeds (P=0.002). On the operated group larger breeds were more adapted to 41D IOLs, small/medium size breeds presenting higher variability in refractive state. Microphthalmic operated patients showed high hyperopia. More studies should be conducted to correlate individual biometric characteristics with needed diopter strength, leading to a wider range of available IOLs in dogs.
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Kuchem, Mallory Kuhlmann. "Ciliary muscle, eye shape, and accommodation in adults with anisometropia." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338254685.
Full textNava, Diane Rachel. "Participation of retinal glucagonergic amacrine cells in the regulation of eye growth and refractive error| Evidence from neurotoxins and in vivo immunolesioning." Thesis, University of California, Berkeley, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10150995.
Full textGrowth is one of the fundamental characteristics of biological systems. The study of eye growth regulation presents an interesting window that allows for the investigation of the role of the visual environment on internal processes. We now know that there is an intricate circuitry within the eye, independent of higher brain processes, that controls the growth of the eye but more needs to be elucidated about these local regulatory circuits. An improved understanding of this circuitry is critical to developing new therapies for abnormalities in eye growth regulation such as myopia, which is impacting more and more individuals around the world each day and in its more severe from, is linked to potentially blinding ocular complications.
The role of retinal glucagon, a neuropeptide, in the regulation of eye growth and refractive error has attracted the interest of researchers over the past 15 years yet there remain many unresolved questions. The research described in this dissertation aimed to elucidate the respective roles in eye growth regulation of specific subpopulations of retinal glucagonergic amacrine cells, which have been the subject of much speculation as the source of inhibitory growth signals, i.e. stop signals, yet not thoroughly investigated.
The approach taken to investigate this problem is to ablate glucagonergic amacrine cells in vivo using different neurotoxins, and to examine how this affects the sign-dependent circuitry of eye growth regulation. In addition, with the advent of advancements in high resolution imaging and electrophysiology, we were able to characterize the effects of these neurotoxins on the region-specific and time-sensitive changes in the structure and function of the living retina.
That the inhibitory response induced by imposed myopic defocus remains intact, in spite of total ablation of glucagon cells (Chapter 5) or elimination of the peripheral glucagon cells (Chapter 3) and other unintended adverse retina effects, compared to findings from previous studies involving QUIS (Chapter 2) of this thesis, is a novel finding. These results point to the same conclusion that glucagon cells themselves are not responsible for the decoding of the sign of optical defocus, but appear to have a role in fine-tuning of compensatory growth responses. The results of our experiments also suggest that the choroid may serve as an intermediate relay, and the altered anterior chamber development raise the further possibility that retina-derived growth modulatory factors also regulate the anterior segment, perhaps reaching this more remote site by diffusion forward through the vitreous chamber or via the uvea.
Miller, Karina Y. "Contact Lens, Academics and Self-Perception Study: Follow-up Results." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586881377813119.
Full textLloyd, Joshua S. "Commercialization of Software for the Prediction of Structural and Optical Consequences Resulting from Corneal Corrective Treatments." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1447778132.
Full textBade, Annette. "Adaptation to Spectacle Wear in Children and Adolescents Diagnosed with Autism." Thesis, NSUWorks, 2014. https://nsuworks.nova.edu/hpd_opt_stuetd/9.
Full textNaël, Virginie. "Impact des troubles visuels sur la perte d'autonomie et le déclin cognitif du sujet âgé Prevalence and associated factors of uncorrected refractive error in older adults in a population-based study in France Visual impairment, undercorrected refractive errors, and activity limitations in older adults : findings from the three-city Alienor study." Thesis, Sorbonne université, 2018. https://accesdistant.sorbonne-universite.fr/login?url=http://theses-intra.upmc.fr/modules/resources/download/theses/2018SORUS271.pdf.
Full textWith the ageing of the population there is an increase of chronic pathologies, leading to functional limitations. Cognitive decline and dementia are the main causes of these limitations, preventing healthy ageing. Visual impairment, frequent in the elderly population and insufficiently managed, could represent a pathway for the prevention of these pathologies. The main objective of this work was to analyze the impact of visual impairment on activity limitations and cognitive impairment and to evaluate to what extent the improvement of vision could improve cognitive and functional health. This work was based on the analysis of 9294 participants from the Three City (3C) cohort and 963 participants from the Alienor ophthalmological study, nested in the 3C study. Detailed data on cognition, activity limitations and vision are available in these cohorts. In our study, we estimated that 38.8% of older adults had refractive errors (myopia, astigmatism, and hyperopia) which were poorly or not corrected by lenses or glasses. An effect of visual impairment on activity limitations has been found from a visual acuity less than 20/25 and nearly 1/5 of limitations could be avoided by best-achieved optical correction. Visual impairment was also associated with an increased risk of dementia over a 12-year follow-up period, with a higher risk in participants with both visual impairment and depressive symptoms. Nevertheless, no longitudinal associations were found with cognitive decline. This thesis provides supplementary arguments to promote a better management of visual impairment in prevention of functional limitations; however, further studies are needed to study the impact of visual impairment on cognitive decline and dementia
Gammoh, Yazan S. S. "Refractive error, ocular biometry and oculomotor function: The prevalence of myopia and its potential risk factors in the Middle East, with an investigation of dynamic accommodation responses and axial length fluctuations in young myopic adults." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5376.
Full textHookway, Larry Allen. "Assessment of Patient Satisfaction and Willingness to Pay for Ready-Made Bifocals and Reading Spectacles in a 35 Years or Older Clinic Population in Granada, Nicaragua." Thesis, NSUWorks, 2011. https://nsuworks.nova.edu/hpd_opt_stuetd/2.
Full textHoseini, Yazdi Seyed Hosein. "Spatial characteristics of the response of the human choroid to imposed defocus." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/120362/1/Seyed%20Hosein_Hoseini%20Yazdi_Thesis.pdf.
Full textGammoh, Yazan Sultan Sa¿ad. "Refractive error, ocular biometry and oculomotor function : the prevalence of myopia and its potential risk factors in the Middle East, with an investigation of dynamic accommodation responses and axial length fluctuations in young myopic adults." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5376.
Full textGreiner, Katie Lynn. "Quality of Life of Pediatric Bifocal Soft Contact Lens Wearers." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243463393.
Full textGuisasola, Valencia Laura. "Distribució de l'impediment visual a la població adulta de Catalunya." Doctoral thesis, Universitat Pompeu Fabra, 2014. http://hdl.handle.net/10803/286788.
Full textVision is considered an important indicator of the health status and quality of life of both individuals and communities, and reliable data on the distribution of visual impairment is an essential planning tool for the development of public health policies. The overall aim of this study was to resolve the problem of lack of data on visual impairment in Catalonia, and to improve the effectiveness of data collection on visual health for public policy planning. This study produced four main findings: a) for the first time, it provides data on visual impairment in adults in Catalonia, showing a higher prevalence among women, seniors and people of lower socioeconomic status; b) it introduces new questions on vision, giving ESCA the capacity to influence health policy planning; c) it reveals that corrected refractive error in the working population is concentrated mainly among women and non-manual workers; and d) it confirms that the use of optical correction is more common among socially advantaged groups and in certain occupations with greater vision requirements