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Relevant bibliographies by topics / Orthokeratology / Dissertations / Theses

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Dissertations / Theses on the topic 'Orthokeratology'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Yoon, Jeong Ho Optometry &amp Vision Science Faculty of Science UNSW. "Modelling outcomes from orthokeratology." Awarded By:University of New South Wales. Optometry & Vision Science, 2009. http://handle.unsw.edu.au/1959.4/40944.

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This research aimed to develop and validate a new method for calculating anterior and posterior corneal topography. The novel calculation method was then used to evaluate the influence of orthokeratology (OK) lens wear and overnight edema on posterior corneal shape, and to develop a physical model for anterior and posterior corneal shape changes during myopic overnight OK. The new method uses anterior corneal topographic data derived from the Medmont E300 corneal topographer, and total corneal thickness data measured along the horizontal corneal meridian using the Holden-Payor optical pachomet

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2

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 edem

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3

Goris, K. G. "Orthokeratology, binocular co-ordination and myopia control." Thesis, London South Bank University, 2017. http://researchopen.lsbu.ac.uk/2246/.

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This work investigates two key questions: ; how myopia progression control treatments impact accommodation and binocular vision function and if accommodation and binocular vision function prior to myopia control interventions has any association with the efficacy of treatment. The work is made up of four main studies. Study 1 was a review and re-analysis of a previously completed study to investigate whether there are any possible associations between accommodation and binocular vision status prior to lens wear which may impact the myopia control efficacy of orthokeratology lens treatment. The

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4

Choo, Jennifer Denise Optometry &amp Vision Science Faculty of Science UNSW. "Orthokeratology epithelial changes and susceptibility to microbial infection." Publisher:University of New South Wales. Optometry & Vision Science, 2008. http://handle.unsw.edu.au/1959.4/42606.

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Orthokeratology (OK) is a specialty contact lens procedure that involves the overnight wear of lenses to reshape the corneal tissue resulting in clear vision upon lens removal. Currently it is the only way of achieving clear vision without having to wear spectacles or contact lenses during the day or undergoing refractive surgery. This thesis investigated the effects of this procedure on the corneal epithelium and the potential increase in risk of microbial infection in an animal model. The cat was first established as an appropriate animal model in a pilot study to examine OK epithelial ch

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5

Parkinson, 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.

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Aim: This study looks at the effect of orthokeratology on a number of biometric parameters and refractive error in an adult population. Method: Forty three myopic subjects were recruited to a twelve month study into the effects of orthokeratology on ocular biometry and refractive error. Two different back surface lens designs were applied right eye) pentacurve and left eye) aspheric. The aspheric design was chosen to more closely mimic the cornea's natural shape. Anterior and posterior apical radii and p-values; corneal thickness and anterior chamber depth were measured using the Orbscan IIz;

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6

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 c

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7

Nilsson, Emelie. "Changes in the intraocular pressure value, when wearing orthokeratology lenses." Thesis, University of Kalmar, School of Pure and Applied Natural Sciences, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hik:diva-2280.

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<p>Introduction: Quite new on the Swedish market are orthokeratology lenses, used for both correction and myopia control. At the moment there are 22 practitioners in Sweden fitting orthokeratology lenses and 5 of those stands for 75 % of all fittings. Measuring the intraocular pressure in the eye is an important part of an eye- examination, because high intraocular pressure can result in glaucomatous changes. When using the orthokeratology lenses the corneal thickness changes, it decreases in the central epithelium and increases in the midperipheral stroma. The corneal thickness is affecting t

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8

Gifford, Paul Optometry &amp Vision Science Faculty of Science UNSW. "Short term refractive and corneal topographic changes in hyperopic orthokeratology." Publisher:University of New South Wales. Optometry & Vision Science, 2009. http://handle.unsw.edu.au/1959.4/43760.

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Although there is considerable published research on the efficacy and corneal response to orthokeratology (OK) lenses that flatten corneal curvature to correct myopia, the effects of OK lenses that attempt to steepen corneal curvature to correct hyperopia are poorly understood. This project investigated the effects of hyperopic OK lens wear on corneal shape, refraction and vision. Open-eye and closed-eye overnight studies were conducted with proprietary hyperopic OK lenses, and these led to the development of an experimental hyperopic OK lens design which allowed manipulation of individual le

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9

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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10

Gifford, Kate L. "Binocular visual function in orthokeratology contact lens wear for myopia." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/116154/1/Kate_Gifford_Thesis.pdf.

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Orthokeratology (OK) contact lenses have shown propensity for slowing down the worsening of myopia in children and young adults, with only some understanding of the mechanism. This thesis examined eye muscle coordination and focussing in OK contact lens wear; outcomes were consistent with a lower myopia progression risk and improved visual comfort compared to standard spectacles and soft contact lenses. These findings have relevance for patient acceptance, clinical management protocols and understanding OK's optical impact on the visual system of the young myope.

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11

Gardner, Dustin J. "Investigation of Myopic Periphery Affecting Choroidal Thickness." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366286421.

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12

Alderson, Alison J. "Structural and functional aspects of myopia in young adults. An investigation of nearwork-induced transient myopia and accommodation in relation to refractive stability." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5518.

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This thesis has investigated nearwork-induced transient myopia and accommodation responses in relation to refractive stability, multichromatic stimuli and orthokeratology. Five individual studies have been carried out. Initially an investigation into the temporal and dioptric aspects of nearwork-induced transient myopia was undertaken, suggesting that increased task duration does not increase the level, or slow the regression of post-task NITM, however an increase in the dioptric demand of the task does. In the second study, a longitudinal myopia progression study, these findings were related

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13

Haque, Sameena. "In Vivo Imaging of Corneal Conditions using Optical Coherence Tomography." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2976.

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Purposes: To use optical coherence tomography (OCT) to image and quantify the effect of various corneal conditions, in terms of corneal, stromal and epithelial thickness, and light backscatter. To assess the changes caused by overnight orthokeratology (Corneal Refractive Therapy; CRT<sup>TM</sup>) lens wear, keratoconus and laser in-situ keratomileusis (LASIK) refractive surgery, each of which may lead to topographical alterations in corneal thickness either by temporary moulding, degeneration, or permanent laser ablation, respectively. <br /><br /> Methods: Topographical thickness of

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14

Alderson, Alison. "Structural and functional aspects of myopia in young adults : an investigation of nearwork-induced transient myopia and accommodation in relation to refractive stability." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5518.

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This thesis has investigated nearwork-induced transient myopia and accommodation responses in relation to refractive stability, multichromatic stimuli and orthokeratology. Five individual studies have been carried out. Initially an investigation into the temporal and dioptric aspects of nearwork-induced transient myopia was undertaken, suggesting that increased task duration does not increase the level, or slow the regression of post-task NITM, however an increase in the dioptric demand of the task does. In the second study, a longitudinal myopia progression study, these findings were related

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15

Mathur, Ankit. "Peripheral ocular monochromatic aberrations." Queensland University of Technology, 2009. http://eprints.qut.edu.au/30384/.

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Aberrations affect image quality of the eye away from the line of sight as well as along it. High amounts of lower order aberrations are found in the peripheral visual field and higher order aberrations change away from the centre of the visual field. Peripheral resolution is poorer than that in central vision, but peripheral vision is important for movement and detection tasks (for example driving) which are adversely affected by poor peripheral image quality. Any physiological process or intervention that affects axial image quality will affect peripheral image quality as well. The aim of th

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16

Pérez, Corral Juan Enrique. "Caracterización de la regresión diurna en ortoqueratología." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/673192.

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The first papers on the fitting of ortho-k lenses in ametropic individuals, treatment that allows them to enjoy good vision without the need to wear glasses or contact lenses, were published almost 60 years ago. Both the reversibility of the treatment when the lenses are discontinued, as well as the slight loss of the effect suffered by users throughout the day have been studied, but there is no paper to date that justifies or foresees diurnal regression based on corneal biomechanical properties provided by the Corvis ST® tonometer. OBJECTIVES: To assess how the corneal and visual parameters v

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17

Wu, Chuan-Sheng, and 吳全盛. "Quality of Life Post Overnight Orthokeratology." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/58584544328359105191.

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碩士<br>中臺科技大學<br>醫學工程暨材料研究所<br>100<br>Purpose. Orthokeratology (OK) is a clinical technique that uses specially designed rigid contact lenses to reshape the cornea to temporarily reduce or eliminate refractive error.This study is aimed to evaluate the quality of life post overnight orthokeratology. Methods. Patients were randomly selected from consecutive cases among the clinic population who undergo orthokeratology after one year.All subjects were free from diseases such as keratoconus, glaucoma, diabetes mellitus, and history of previous contact lens wear, ocular surgery, ocular trauma and fa

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18

CHIANG, HSIN-JU, and 江炘如. "The Study of Microbial Contamination on Orthokeratology Trial Lenses." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/28048841480497038522.

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碩士<br>中臺科技大學<br>醫學工程暨材料研究所<br>104<br>Purpose. The purpose of this study is discussing orthokeratology trial lens pollution in used over period of time, and to understand the degree of microbial contamination effects by number amount times. Methods. This study collects orthokeratology trial lenses which have been worn for 1 year (N=77). The PBS ( Phosphate buffered saline ) was used to sample the inner surface to collect bacteria. Bacteria solution onto BAP、CAP、SDA incubate at 37 ° C in an atmosphere containing 5% CO2 for 48 hours. Results. Of the 77 samples, 68 (88.3%) were sterile, whereas 9

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19

Ramkissoon, Prithipaul. "A clinical evaluation of overnight orthokeratology as a method of vision correction." Thesis, 2014. http://hdl.handle.net/10210/12293.

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20

Liu, Jung-Hua, and 劉容華. "The Relationship between Corneal Biomechanical Properties and Visual Acuity after Orthokeratology." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/09769957991131622157.

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碩士<br>中臺科技大學<br>視光產業碩士專班<br>102<br>The main purpose of this study was to investigate the potential relationship between biomechanical properties of the cornea ( corneal hysteresis and corneal resistance factor) and the visual performance after using orthokeratology correction on young people. The data was collected from Taipei Daan B&B Eye clinic from February to December 2013. 35 juvenile myopia patients (65 eyes, 24 males and 11 females) was recruited and the average age was 12.5 ± 3.3 years old, range from 7.5 to 25.4 years old. The mean spherical equivalent is -3.18 ± 1.50D and the spheric

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21

Huang, Po-Wei, and 黃柏緯. "Factors retarding myopia progression on Taiwanese school children with overnight Orthokeratology contact lens." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/nuqn6k.

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碩士<br>中山醫學大學<br>生物醫學科學學系碩士班<br>102<br>In Taiwan, the percentage of myopia has reached as high as 62%. The current control myopia methods include bifocal spectacle lenses, progressive spectacle lenses, soft bifocal contact lenses, biological agents such as atropine and pirenzepine as well as orthokeratology (Ortho-K).Ortho-K provides clear vision despite of not wearing lenses during daytime. The Ortho-K has been proven to be effective in terms of delaying the development of myopia, but the mechanism behind it still awaits further clarification. The purpose of this study is to evaluate the chang

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22

LIN, HSIU-LING, and 林秀玲. "Corneal-Curvature, Visual Acuity, and Spherical Equivalents change for OrthoKeratology treatment in Taiwan." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/hgb739.

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碩士<br>嘉南藥理大學<br>藥學系<br>107<br>OrthoKeratology lens, or OrthoK, is an anti-geometric hard contact lens. It is worn before going to bed then can be maintained high quality vision during daytime removal. Therefore, it is a good way to clinically control myopia. The purpose of this retrospective study was to evaluate the effect of wearing OrthoK lenses on corneal curvature, visual acuity, and spherical equivalents. Eighty-five subjects in the experimental group were included routine eyesight examination without any eye disease, myopia was between -0.50 D and -6.50 D, astigmatism was between -0.50

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23

Lin, Jui-Yu, and 林芮宇. "The Change of Ocular Aberration and Corneal Shape in Children after Wearing Overnight Orthokeratology Lenses." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/81706756682216338159.

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碩士<br>中山醫學大學<br>生物醫學科學學系碩士班<br>104<br>Background: According to the statistics, the prevalence level of myopia has reached over 90% of the population in Taiwan. The methods of control myopia include Atropine, multifocal spectacle, and overnight orthokeratology. Orthokeratology is a temporally non-surgical correction of refractive errors. The special design of orthokeratology lens can offset the patient’s refractive error when patient sleep. Due to the lens design, cornea is reshaped and thickness changed. Cornea reshaping causes the thickness changes in central and peripheral region and thus in

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24

Yang, Hsiu-Wan, and 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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碩士<br>中臺科技大學<br>醫學工程暨材料研究所<br>98<br>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

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25

WANG, SHUN-HUAN, and 王舜渙. "Discussion on the Effect of Low Concentration Long-Acting Mydriatics on Myopia Control of School Children in Orthokeratology." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/cvqwnx.

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碩士<br>元培醫事科技大學<br>企業管理系碩士班<br>107<br>Discussion on the effect of low concentration long-acting mydriatics on myopia control of school children in orthokeratology Student：Shun-Huan Wang Advisor：Che-Yang Lin, Ph. D. Graduate Institute of Business Administration Yuan-pei University of Medical Technology Abstract The prevalence of nearsightedness among schoolchildren in Taiwan is extremely high and rising; the proportion of people who suffer from the high myopia is also increasing, which poses a great threat to the health of national visual acuity. The most effective method of myopia con

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TING, CHIH-CHIANG, and 丁志強. "A 5-year Followup Comparative Analysis using Orthokeratology Lenses vs Atropine for Controlling Myopia and Astigmatism in Taiwan." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7annmw.

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碩士<br>元培醫事科技大學<br>生物科技暨製藥技術系碩士班<br>106<br>Myopia has been a big problem for the health of Chinese people. High myopia is prone to some complications such as retinal detachment and macular degeneration and glaucoma and cataract. Therefore, it is important to prevent children's myopia from increasing to high myopia. There are two main methods used in Taiwan to slow down and suppress the increase in diopters, namely using mydriatic agent and keratoplasty contact lenses. The mydriatic agent, also known as the ciliary muscle paralysis agents, are parasympathetic blockers. It is to relax the ciliary

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27

Costa, Jéssica Tatiana Leitão da. "Alterações na resposta retiniana durante o tratamento ortoqueratológico." Master's thesis, 2019. http://hdl.handle.net/1822/65486.

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Dissertação de mestrado em Optometria Avançada<br>Nos últimos anos tem sido desenvolvidos vários estudos sobre a miopia, tendo como base a sua progressão e as mudanças oculares a ela associada. Desta forma, são várias as técnicas em estudo para controlar a sua progressão. A ortoqueratologia é caracterizada por ser um dos tratamentos óticos que demonstra de forma sistemática a sua efetividade no controlo da progressão da miopia. No entanto, apesar de ser conhecida a sua eficácia, é necessário continuar a identificar os mecanismos (acomodativos, retinianos ou outros) responsáveis pelo efeito pro

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28

Marcotte-Collard, Rémy. "Analyse et comparaison de l’effet cornéen du traitement d’orthokératologie." Thèse, 2017. http://hdl.handle.net/1866/21327.

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