Long-term effect of orthokeratology on the anterior segment length

Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association
Sin-Wan Cheung, Pauline Cho

Abstract

To compare the effects of normal growth and longer term use of orthokeratology (ortho-k) on ocular biometric parameters in the anterior segment, including central corneal thickness (CCT), anterior chamber depth (ACD), crystalline lens thickness (CLT), and anterior segment length (ASL). Baseline and six monthly data were retrieved from 78 subjects (aged 7-10 years, with myopia≤4.00D and astigmatism≤1.25D) who had completed a two-year randomized clinical trial using ortho-k for myopia control. They were randomly assigned to wear ortho-k lenses or single-vision spectacles (control). Anterior segment parameters were measured with the Pentacam after cycloplegia. No significant changes in CLT and ASL over time were observed in either group of subjects (37 ortho-k; 38 control). In the control group, CCT remained unchanged during the study period but in the ortho-k group, it was significantly reduced by an average of 0.009mm by the 6-month visit (p<0.001) and remained unchanged thereafter. No significant changes in ACD was found in the ortho-k group but it was significantly increased by an average of 0.04mm (p=0.001) in the control group. CLT nor ASL did not change over time in either control or ortho-k subjects. Although ACD significa...Continue Reading

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Sep 13, 2012·Investigative Ophthalmology & Visual Science·Pauline Cho, Sin-Wan Cheung
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Citations

Mar 1, 2019·Investigative Ophthalmology & Visual Science·James S WolffsohnKovin Naidoo
Jan 14, 2020·The Cochrane Database of Systematic Reviews·Jeffrey J WallineJ Daniel Twelker
Sep 6, 2020·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Stephen J VincentPauline Cho
May 26, 2018·Eye and Vision·António QueirósJosé Manuel González-Méijome
Mar 30, 2021·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·Stephen J VincentLyndon Jones

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