Bibliografie tematiche / Contact lenses; Orthokeratology

Letteratura scientifica selezionata sul tema "Contact lenses; Orthokeratology"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Contact lenses; Orthokeratology"

Conway, Martin. "Orthokeratology for soft lens dryness". Eye 22, n. 130 (giugno 2020): 22–24. http://dx.doi.org/10.33791/2222-4408-2020-2-22-24.

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Most users of soft contact lenses sooner or later face the problem of dry eyes when wearing them. Despite the development of polymer chemistry for contact lenses, which include additional moisturizing components, this problem is still relevant today. The use of tear substitutes and moisturizers is effective at the initial stage of treatment. In this regard, the appointment of orthokeratological lenses to users with soft contact lenses may be one of the possible solutions, including in patients of presbyopic age.

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Olenich, Mariya. "Use of orthokeratology contact lenses in the treatment of progressive myopia". Spravočnik vrača obŝej praktiki (Journal of Family Medicine), n. 7 (1 luglio 2020): 18–22. http://dx.doi.org/10.33920/med-10-2007-02.

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Orthokeratology is a method of non-surgical correction of refraction, which is based on the principle of biomechanical changes in the curvature of the cornea under the influence of «reverse geometry». This method was developed more than 50 years ago, however, it became widely used only in the early 2000s. The basis of this method is the use of special orthokeratology lenses that patients wear during the night. Peculiarity of these lenses is the ability to change curvature of the cornea, resulting in a flattening of its central part and thickening of the paracentral and peripheral sections, which leads to the formation of positive spherical aberration of the optical system. Such changes in the cornea resulting from partial desquamation of keratocytes and changes in their shape during 7–8 hours of influence during the night, lead to the normalization of refraction, which persists for the next 24 hours. Most often this method of vision correction is used in children and adolescents, since it allows not only to optimize visual acuity for a certain period of time, but also to stop the progression of myopia. Another indication for the correction of vision using orthokeratology lenses includes active sports and situations that exclude the possibility of wearing glasses or soft contact lenses.

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Poskrebysheva, Z. N., A. A. Tyurina, O. A. Zhabina, S. E. Avetisov e A. V. Myagkov. "Еffects of optical correction methods on accomodation in children with progressive myopia (literature review)". POINT OF VIEW. EAST – WEST, n. 2 (31 maggio 2021): 76–78. http://dx.doi.org/10.25276/2410-1257-2021-2-76-78.

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Accommodation disorders in young people are more common than diagnosed. This review is based on the data of domestic and foreign literature and studies the effect of contact lenses of various designs on accommodation. Particular attention has been given to bifocal soft contact lenses as one of the recognized interventions for treating juvenile progressive myopia and their ability to slow axial elongation. Key words: accommodation, myopia control, bifocal contact lenses, orthokeratology.

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Santodomingo-Rubido, Jacinto, César Villa-Collar, Bernard Gilmartin e Ramón Gutiérrez-Ortega. "Myopia Control With Orthokeratology Contact Lenses in Spain". Eye & Contact Lens: Science & Clinical Practice 39, n. 2 (marzo 2013): 153–57. http://dx.doi.org/10.1097/icl.0b013e31827a0241.

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Jones, Deborah, Craig Woods, Nathan Efron e Philip Morgan. "Contact lens prescribing in Canada 2011". Canadian Journal of Optometry 74, n. 2 (20 marzo 2012): 35. http://dx.doi.org/10.15353/cjo.74.566.

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The annual survey to collect data on the contact lens prescribing preferences of practitioners has continued for 12 years in Canada. Practitioners were surveyed for information on the first 10 patients they fitted with contact lenses immediately after receipt of said survey. A total of 121 completed surveys were returned, detailing contact lens fittings for 1,184 patients. Of the patients fitted with contact lenses, the results indicated that the majority were prescribed soft lenses. The preferred modality was monthly planned replacement and over 67 per cent of the soft lens fits were made of silicone hydrogel materials. Of the rigid lens fits, the majority were prescribed for daily wear, as the overnight use of rigid lenses appears to be mainly for orthokeratology. Practitioners are recommending multipurpose solutions for the majority of their soft lens patients (85.6%).

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Kim, Jaeyoung, Mee Kum Kim, Won Ryang Wee e Joo Youn Oh. "Mooren Ulcer in a Child Wearing Orthokeratology Contact Lenses". Eye & Contact Lens: Science & Clinical Practice 44, n. 4 (luglio 2018): e13-e15. http://dx.doi.org/10.1097/icl.0000000000000341.

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Sitka, M. M., S. G. Bodrova e N. A. Pozdeyeva. "The Effectiveness of Different Optical Correction Methods in Children and Adolescents with Progressive Myopia Based on a Comparative Evaluation of the Accommodation and Axial Length of Eyes". Ophthalmology in Russia 15, n. 2S (28 luglio 2018): 65–72. http://dx.doi.org/10.18008/1816-5095-2018-2s-65-72.

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Objective: to determine optimal method of progressive myopia optical correction in children and adolescents.Patients and methods. Conducted 5-year prospective clinical and instrumental examination of 494 children with myopia using orthokeratology lenses, soft contact lenses and glasses. 61 children (the average age 11.7 ± 2.36 years) with myopia –2.87 ± 1.1 D and astigmatism –0.58 ± 0.27 D used orthokeratological lens. 92 children (the average age 12.8 ± 1.51 years) with myopia –3.66 ± 1.07 D, astigmatism –0.53 ± 0.18 D wore soft contact lens. 79 children (the average age 11.52 ± 1.78 years) with myopia –1.59 ± 1.08 D, astigmatism –0.71 ± 0.54 D used glasses with monofocal lenses, with full correction. The control group consisted of 249 children (the average age 9.1 ± 1.14 years) with initial emmetropia. Determination of refraction, subjective and objective determination of accommodation, and axial length of the eye (“IOL-master”) was conducted in children.Results. The maximum progression of myopia was observed in younger children (8–9 years). Correction of myopia with orthokeratology lenses (OKLs) was accompanied by the lowest dynamics of changes in axial length (axial elongation 0,44 ± 0,32 mm) compared to the correction with soft contact lenses (SCLs) (axial elongation 0,73 ± 0,36 mm), spectacle correction (axial elongation 1,39 ± 0,47 mm) and the control group (axial elongation 0,6 ± 0,41 mm). In all children with myopia, at the beginning of the study, there were reduced values reserve of relative accommodation and an objective accommodative response. Correction of myopia with OKLs (p = 0,0002) and SCLs (p = 0,036) provides the normalization of subjective and objective reserve indication of relative accommodation in both age group in comparison of spectacles correction.Conclusion. Correction with orthokeratology lens in children with progressive myopia contributes to the minimum growth length of the eye. Correction of myopia OKLs and MKL improves of subjective and objective indicators of relative accommodation reserve.

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Zhabina, Olga. "Possible adverse effects of the use of orthokeratology lenses (literature review)". Eye 22, n. 130 (giugno 2020): 26–29. http://dx.doi.org/10.33791/2222-4408-2020-2-26-29.

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Orthokeratology is a method of correction of ametropia, which has been widely used throughout the world. In the presented review, based on the data of domestic and foreign literature, possible undesirable phenomena that occur when using orthokeratological lenses are described. Scien¬tists come to the conclusion that, despite the possibility of complications, the risk of undesired symptoms is significant¬ly reduced when the rules of the use and care of orthokera¬tology lenses are strictly followed, and that their incidence is less frequent than when using soft contact lenses.

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Lui, Wai-On, Marion H. Edwards e Pauline Cho. "Contact lenses in myopia reduction — from orthofocus to accelerated orthokeratology". Contact Lens and Anterior Eye 23, n. 3 (gennaio 2000): 68–76. http://dx.doi.org/10.1016/s1367-0484(00)80015-6.

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Özyol, Pelin, Ömür Uçakhan-Gündüz, Erhan Özyol e Ayfer Kanpolat. "Overnight orthokeratology with two brands of reverse-geometry contact lenses". Contact Lens and Anterior Eye 36, n. 3 (giugno 2013): 106–12. http://dx.doi.org/10.1016/j.clae.2012.10.084.

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Più fonti

Tesi sul tema "Contact lenses; Orthokeratology"

Jayakumar, Jaikishan Optometry &amp Vision Science Faculty of Science UNSW. "Age related variations in anterior ocular characteristics and response to short term contact lens wear". Awarded by:University of New South Wales. School of Optometry and Vision Science, 2005. http://handle.unsw.edu.au/1959.4/22443.

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The purpose of this thesis was to investigate age related variations in anterior ocular characteristics and their effect on the response to short-term (one-hour) open eye orthokeratology (OK) lens wear and overnight hydrogel lens wear. Sixty-three volunteer subjects were divided into three groups comprising children (Group I), young adults (Group II) and older adults (Group III). Anterior ocular characteristics that were measured included corneal topography with the Medmont corneal topographer, total, stromal and epithelial thickness with the Holden-Payor optical pachometer, microscopic cell characteristics with the confocal microscope, corneal aesthesiometry, corneal modulus of elasticity, and tear film, palpebral and eyelid characteristics. The older cornea was found to be more spherical in shape (asphericity Q = -0.24 ?? 0.07 in group III compared to -0.34 ?? 0.09 and -0.32 ?? 0.17 in groups I and II respectively) and showed a tendency from with-the-rule to against-the-rule astigmatism. Older subjects also had a decreased endothelial cell density (2596 ?? 111 cells/mm2 in group III compared to 2793 ?? 138 cells/mm2 in group II) and reduced eyelid tension compared to the younger groups. Children were found to have lower blink rates than adults. It was concluded that these changes might have a significant impact on contact lens wear. The responses to two contact lens based techniques, orthokeratology (OK) and hydrogel overnight wear (ON), were studied. Sixty subjects (20 per group) wore reverse-geometry lenses (BE, Ultravison Aust Pty Ltd) of Boston XO material in one eye under open eye conditions for one hour in one eye only. Changes in unaided visual acuity, corneal curvature, corneal thickness and confocal microscopic variables were measured after OK lens wear. All subject groups showed statistically significant improvements (p < 0.05) in unaided visual acuity, a trend for more positive (less prolate) corneal asphericity, increase in apical corneal radius and decrease in central total corneal thickness, after OK lens wear. When the groups were stratified, statistical significance was obtained between the older group and the other two younger groups for change in apical corneal radius (0.23 ?? 0.01 mm in group I, 0.15 ?? 0.01 mm for group II, 0.06 ?? 0.33 for group III). The change in asphericity also showed significant differences between the older age group (0.10 ?? 0.08 mm) and the young adult group (0.21 ?? 0.13). Central corneal thinning obtained after one hour of OK lens wear revealed significant differences between the older adult group (-1.9 ?? 3.2 ??m) and the other two groups (-5.0 ?? 5.9 ??m in group I, -5.0 ?? 2.0 ??m for group II). Sixty subjects wore hydrogel lenses (One-Day Acuvue, Johnson and Johnson Visioncare Pty Ltd) made of etafilcon A in one eye only overnight during sleep at their home. Changes in unaided visual acuity, corneal curvature, corneal thickness, confocal microscopic variables and slitlamp variables were measured after ON lens wear. All subjects showed significant thickening (p < 0.05) of the cornea with ON wear, more in the lens-wearing eye. This study reported that the edema response induced by Acuvue contact lenses is stromal in origin. The edema response of the older group (33.9 ?? 11.5 ??m) was lower than the other two groups as demonstrated by the difference in the change in central stromal thickness (49.3 ?? 20.3 ??m for group I and 51.0 ?? 20.0 ??m for group II). However, a statistically significant difference in the change in thickness was not reached either for the central total corneal thickness or for other topographic locations. Corneal and visual changes found in this study confirm previous reports of the effects of short term OK and hydrogel ON lens wear. Older lens wearers showed a reduced or delayed response to short-term lens wear. Studies investigating the effects of age with long lens-wearing durations are warranted to quantify these effects further.

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Alharbi, Ahmed A. Optometry &amp Vision Science Faculty of Science UNSW. "Corneal response to overnight orthokeratology". Awarded by:University of New South Wales. School of Optometry and Vision Science, 2005. http://handle.unsw.edu.au/1959.4/22515.

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Orthokeratology (OK) is the reduction, modification or elimination of myopia through application of contact lenses. With the development of high Dk/t lens materials, overnight therapy has become the modality of choice for OK. Overnight OK lens wear has been previously investigated in terms of its efficacy to reduce myopia. However, the underlying effects of overnight OK lens wear on the human cornea have received less attention. As well as the clinical efficacy of overnight OK, this study investigated the effects of overnight OK on topographical corneal thickness and the overnight corneal edema response, and corneal tissue changes with overnight OK. Eighteen subjects participated as the OK lens-wearing group, wearing BE lenses (UltraVision, Brisbane, Queensland) in both eyes. A further ten subjects participated as control subjects, wearing conventional rigid lenses (J-Contour, UltraVision) in the right eye (RE) only. The left eye (LE) acted as a non-lens-wearing control. Both groups wore lenses overnight only, with no lens wear during the day. Measurements were conducted at baseline then on day 1, 4, 10, 30, 60, and 90 for the OK lens-wearing eyes; and up to day 30 for the control group, in the morning (after overnight lens wear) and in the evening (after 8-10 hours of lens removal). Variables measured included best vision sphere (BVS), unaided logMAR visual acuity (VA), refractive astigmatism, apical corneal power (ACP), simulated K readings (Medmont E300 corneal topographer), topographical corneal thickness (Holden-Payor optical pachometer), and keratocyte and endothelial cell densities (ConfoScan2 confocal microscope). Approximately 75% of myopia was corrected after the first night of OK lens wear and the changes in refractive error stabilised by day 10. By day 90, myopia reduction averaged 2.54 ?? 0.63 D. This was associated with significant improvement in unaided VA of about 82% after the first night of lens wear. There was no change in refractive astigmatism over the 3-month period. There was significant reduction in ACP in the OK lens-wearing eyes after the first night of lens wear, which accounted for more than 70% of the total ACP change over the 3-month period (RE: -2.16 ?? 0.53 D; LE: -2.11 ?? 0.86 D). There was significant central epithelial thinning (about 30%) and significant thickening (about 3%) in the mid-peripheral stroma in the OK lens-wearing eyes. Significant central epithelial thinning was found after the first night of lens wear while thickening in the mid-peripheral stroma reached statistical significance by day 4. Further analysis suggests that topographical corneal thickness changes account for the refractive error changes with overnight OK lens wear, rather than corneal bending. The central overnight stromal edema response was significantly reduced in the OK lens-wearing eyes (1.2 ?? 0.5%) to a level lower than in the conventional RGP (6.2 ?? 1.2%) and non-lens-wearing eyes (2.5 ?? 0.9%) in the control group. Mid-peripheral and peripheral stromal edema responses showed similar levels to those predicted based on lens Dk/t. A single overnight wear of BE and Paragon Corneal Refractive Therapy (CRT) lenses showed that the edema response to BE lens wear is significantly less than in the CRT lens-wearing eyes (BE: 2.5 ?? 0.7%; CRT 3.5 ?? 1.3%) immediately on eye opening. No significant changes were found in either central stromal keratocyte or endothelial cell densities in either OK or control groups over the study period. In conclusion, overnight OK lens wear induces significant reductions in myopia after the first night of lens wear associated with improvement in unaided VA. Overnight OK lens wear causes significant thinning in the central epithelium and significant mid-peripheral stromal thickening which results in flattening of the central cornea and steepening in the mid-periphery. Although there were no significant changes in central stromal keratocyte and endothelial cell densities, thinning of the central epithelial layer raises concerns regarding the safety of the procedure, especially with the alarming number of corneal infections reported recently in the literature.

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Glavine, Kristin Ann. "Using corneal characteristics to predict corneal change in overnight orthokeratology /". Adobe Acrobat Reader required to view document, 2009. http://www.neco.edu/library/theses/GlavineThesisApr09.pdf.

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Yang, Hsiu-Wan, e 楊琇琬. "Comparison of Mechanical Properties between Reverse Geometry Orthokeratology and Conventional Rigid Gas Permeable Contact Lenses". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/41206778602021390375.

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Abstract (sommario):

碩士
中臺科技大學
醫學工程暨材料研究所
98
Purpose. The ability of resistance to breakage is important for the durability of a contact lens and also the safety of wearer. The aim of this study is to understand the mechanical properties of reverse geometry orthokeratology (OK) lens design when compared with conventional standard (alignment fitted) lens design of the same gas permeable contact lens material. Methods. Reverse geometry orthokeratology and conventional alignment lenses designs with identical back optical zone radius, total diameter, back vertex power, center thickness, edge thickness and lens material were chosen for this comparison study. The flexural strength, flexural deformation at rupture and flexural strength at 30% deformation were measured using the Instron 4301 automated materials testing instrument. Results. The flexural strength at rupture of reverse geometry lenses (369±56 gf) and alignment lenses (339±10 gf) were not significantly different (p=0.465). The flexural deformation at rupture of reverse geometry lenses and alignment lenses were 72±5 % and 73±2 %, respectively, without significant differences as well (p=0.602). However, the flexural strength at 30 % deformation of reverse geometry lenses (121±9 gf) was significantly higher than that of conventional alignment rigid gas permeable lenses (77±3 gf)(p=0.009 ). Conclusions. Reverse geometry orthokeratology lens design showed higher flexural strength at 30 % deformation compared to conventional alignment lens design. This suggest that reverse geometry lens design have less tendency to change its geometric parameters during pressure.

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Libri sul tema "Contact lenses; Orthokeratology"

T, Kame Rodger, a cura di. Orthokeratology handbook. Boston: Butterworth-Heinemann, 1995.

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Mountford, John, David Ruston e Trusit Dave. Orthokeratology: Principles and Practice. Butterworth-Heinemann, 2004.

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Rigid Gaspermeable Lens Fitting. Butterworth-Heinemann, 2006.

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Capitoli di libri sul tema "Contact lenses; Orthokeratology"

Mountford, John. "Orthokeratology". In Contact Lenses, 374–99. Elsevier, 2019. http://dx.doi.org/10.1016/b978-0-7020-7168-3.00019-2.

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Rinehart, John M., e Edward S. Bennett. "Orthokeratology". In Manual of Gas Permeable Contact Lenses, 424–79. Elsevier, 2004. http://dx.doi.org/10.1016/b978-0-7506-7335-8.50023-1.

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RAH, M. "Orthokeratology, Part 1". In Clinical Cases in Contact Lenses, 207–13. Elsevier, 2002. http://dx.doi.org/10.1016/b978-0-7506-9044-7.50043-2.

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MARSDEN, H. "Orthokeratology, Part 2". In Clinical Cases in Contact Lenses, 215–20. Elsevier, 2002. http://dx.doi.org/10.1016/b978-0-7506-9044-7.50044-4.

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"Sample Orthokeratology Agreement and Informed Consent". In Manual of Gas Permeable Contact Lenses, 481–83. Elsevier, 2004. http://dx.doi.org/10.1016/b978-0-7506-7335-8.50024-3.

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Gifford, Paul. "Orthokeratology". In Contact Lens Practice, 296–305. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-7020-6660-3.00032-0.

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RINEHART, J. "Orthokeratology". In Manual of Contact Lens Prescribing and Fitting, 637–86. Elsevier, 2006. http://dx.doi.org/10.1016/b978-0-7506-7517-8.50034-1.

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Atti di convegni sul tema "Contact lenses; Orthokeratology"

Li, Ke, Zhiqiang He, Kai Niu, Fei Luo e Hongxin Song. "Evaluation of Orthokeratology Lenses Fitting Using Combination of K-Means and Least Squares Algorithm". In 2018 International Conference on Network Infrastructure and Digital Content (IC-NIDC). IEEE, 2018. http://dx.doi.org/10.1109/icnidc.2018.8525705.

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