Myopia Reduction Using Corneal Refractive Therapy Contact Lenses

Koffler, Bruce H.; Smith, Vivien M.

doi:10.1097/01.icl.0000140228.24461.1b

Cited by 6 publications

(12 citation statements)

References 3 publications

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“…[23][24][25]31 The slitlamp findings in this investigation are similar to those reported by others in short-term investigations in which most subjects have no positive slitlamp findings. [23][24][25][26] However, Rah et al 31 reported corneal staining after 1 month of overnight lens wear in approximately 80% at a morning visit followed by a 30% reduction at the afternoon visit on the same day. Of all the positive findings reported so far, superficial corneal staining has been the most prevalent positive finding.…”

Section: Discussionsupporting

confidence: 91%

“…Of all the positive findings reported so far, superficial corneal staining has been the most prevalent positive finding. The data from this investigation support Soni et al 23 and indicate a decrease in intensity and incidence with time. However, an increase in corneal neovascularization up to 3 months with stabilization in the following months is not consistent with the findings of Soni et al, 23 who reported no change in neovascularization after overnight wear in their 3-month investigation.…”

Section: Discussionsupporting

confidence: 90%

“…The discontinuation rate for unacceptable vision in this study is similar to that reported by Koffler et al 23 and Soni et al 24 One third of the subjects who completed the investigation were younger than 18 years of age. Sixty-nine percent of the juveniles who entered the study completed 12 months in the study.…”

Section: Discussionsupporting

confidence: 88%

“…These early approvals and the results presented by a number of investigators using various designs and materials have established that low to moderate myopia can be safely and rapidly eliminated with reverse-geometry gas-permeable contact lenses. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] Eye care practitioners are showing considerable interest in the procedure, as shown by more than 500 attendees at the Global Orthokeratology Symposium in Toronto in July 2004. This renewed interest in orthokeratology has spawned curiosity in the media and patients.…”

mentioning

confidence: 99%

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Overnight Orthokeratology Experience With XO Material

Soni¹,

Nguyen²

2006

Eye &Amp; Contact Lens: Science &Amp; Clinical Practice

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 88%

mentioning

confidence: 99%

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Overnight Orthokeratology Experience With XO Material

Soni¹,

Nguyen²

2006

Eye &Amp; Contact Lens: Science &Amp; Clinical Practice

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“…In myopic patients with astigmatism, standard spherical orthokeratology does not consistently change the amount of astigmatism. Some studies have reported that orthokeratology causes significant changes in astigmatism while others have found no significant change in astigmatism …”

Section: Optical Changes With Myopic Orthokeratologymentioning

confidence: 99%

Optical changes and visual performance with orthokeratology

Nti

Berntsen

2020

Clinical and Experimental Optometry

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Orthokeratology has undergone drastic changes since first described in the early 1960s. The original orthokeratology procedure involved a series of lenses to flatten the central cornea and was plagued by variable results. The introduction of highly oxygen‐permeable lens materials that can be worn overnight, corneal topography, and reverse‐geometry lens designs revolutionised this procedure. Modern overnight orthokeratology causes rapid, reliable, and reversible reductions in refractive error. With modern designs, patients can wear lenses overnight, remove them in the morning, and see clearly throughout the day without the need for daytime refractive correction. Modern reverse‐geometry lens designs cause central corneal flattening and mid‐peripheral corneal steepening that provides clear foveal vision while simultaneously causing a myopic shift in peripheral retinal defocus. The peripheral myopic retinal defocus caused by orthokeratology is hypothesised to be responsible for reductions in myopia progression in children fitted with these lenses. This paper reviews the changes in orthokeratology lens design that led to the reverse‐geometry orthokeratology lenses that are used today and the optical changes these lenses produce. The optical changes reviewed include changes in refractive error and their time course, high‐ and low‐contrast visual acuity changes, changes in higher‐order aberrations and visual quality metrics, changes in accommodation, and changes in peripheral defocus caused by orthokeratology. The use of orthokeratology for myopia control in children is also reviewed, as are hypothesised connections between orthokeratology‐induced myopic peripheral defocus and slowed myopia progression in children, and safety and complications associated with lens wear. A better understanding of the ocular and optical changes that occur with orthokeratology will be beneficial to both clinicians and patients in making informed decisions regarding the utilisation of orthokeratology. Future research directions with this lens modality are also discussed.

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Refractive error, visual acuity, and corneal-curvature changes in high and low myopes with orthokeratology treatment: A Malaysian study

Liong

Mohidin

Tan³

et al. 2015

Taiwan Journal of Ophthalmology

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Background/Purpose:The effect of orthokeratology (OK) on low myopia is well known, but there are a few reports on its effect on high myopia. In this study, the parametric changes in high and low myopia as results of wearing OK lenses for a period of 6 months have been analyzed.Methods:Records of schoolchildren (age 7–17 years) undergoing OK treatment from an optometry clinic were retrospectively reviewed. Data involving refractive errors, uncorrected visual acuity, and corneal curvatures at baseline and after 1 day, 1 week, 1 month, 3 months, and 6 months of OK treatment from 25 patients who fulfilled the inclusion criteria were examined. For the analysis, the participants were arbitrarily divided into two groups comprising high myopia (< −6.00 D) and low to moderate myopia (from −1.00 D to −6.00 D).Results:Significant reductions of refractive error, improvement in visual acuity, and corneal-curvature flattening were found in all participants after 6 months of OK lens wear compared to the baseline. No significant changes were found in corneal toricity in both high and low to moderate myopic groups. Almost all of these occurred after one night of lens wear in both the high- and low-myopia groups.Conclusion:The OK lens wear significantly reduced the refractive error and corneal curvature that results in the improvement in visual acuity in both high- and low-myopia groups, and the reduction seemed to occur nearly at the same time despite the difference in initial myopic power. High myopes with refractive power up to −8.25 D would benefit significantly from OK lenses.

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Myopia Reduction Using Corneal Refractive Therapy Contact Lenses

Abstract: The CRT lens is an effective modality for temporary myopic correction for a restricted subset of myopic candidates. Those with a spherical manifest refraction between -1.00 and -6.00 D and up to 1.50 D of astigmatism can expect a good outcome with these lenses.

Cited by 6 publications

References 3 publications

Overnight Orthokeratology Experience With XO Material

Overnight Orthokeratology Experience With XO Material

Optical changes and visual performance with orthokeratology

Refractive error, visual acuity, and corneal-curvature changes in high and low myopes with orthokeratology treatment: A Malaysian study

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