Central corneal iron line arising from hyperopic orthokeratology

Kirkwood, Bradley J; Rees, Ieuan H

doi:10.1111/j.1444-0938.2010.00573.x

Cited by 7 publications

(2 citation statements)

References 9 publications

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“…These iron rings are benign and have no effect on vision but may represent some change in corneal physiology. They occur in both myopic and hyperopic orthokeratology, as early as one week or as late as three and a half years after starting orthokeratology. Cho et al reported that the rings resolved two months after discontinuing orthokeratology.…”

Section: Safety and Complicationsmentioning

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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Section: Safety and Complicationsmentioning

confidence: 99%

Optical changes and visual performance with orthokeratology

Nti

Berntsen

2020

Clinical and Experimental Optometry

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“…Характерным проявлением птеригиума является ли-ния Стокера [26]. Имеются сообщения о формиро-вании пигментированной дуги роговицы в результа-те оптической коррекции гиперметропии жесткими контактными линзами (ортокератология) [27,28]. Образование пигментированных отложений в эпи-телии также возможно в результате хирургических вмешательств на роговице: имплантации интра-стромальных роговичных колец [29], радиальной кератотомии [30], фоторефракционной кератэкто-мии (photorefractive keratectomy, PRK) [31] и лазер-ного кератомилеза (laser-assisted in situ keratomileusis, LASIK) [32].…”

Section: Sem-edsunclassified