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Title: Orthokeratology in low myopia. Part 1 : Efficacy and predictability
Authors: Lui, WO
Edwards, MH
Keywords: Efficacy
Reverse geometry
Rigid gas permeable contact lenses
Issue Date: 2000
Publisher: Elsevier
Source: Contact lens and anterior eye, 2000, v. 23, no. 3, p. 77-89 How to cite?
Journal: Contact lens and anterior eye 
Abstract: Aims. Modern orthokeratology (ortho-k) using reverse geometry lens designs is being widely used for myopia reduction world-wide although there has been no well-controlled clinical trial of this procedure. This paper reports on the efficacy and predictability of an ortho-k procedure using the OK-74 lens design (now known as OK-704). Methods. We carried out a 100-day, controlled, randomised clinical trial in which 14 subjects underwent ortho-k and a further 14 were fitted with aligned rigid contact lenses. Results. The mean reduction in myopia was 1.50 (SD 0.45) D in the ortho-k group and 0.01 (SD 0.20) D in the control group. Unaided vision improved by -0.64 (SD 0.22) logMAR units in the ortho-k group, compared with -0.09 (SD 0.11) units in the control group. Variables which correlated with refractive change were corneal thickness, p-value of the nasal semi-meridian and the difference between central and peripheral corneal powers. A multiple-factors model can account for 72% of the refractive change. Conclusions. Ortho-k using the OK-74 lens design achieved an average myopia reduction of 1.50 D. The model developed can provide an estimate of the refractive change likely to occur in ortho-k, a matter of importance to both clinician and patient.
ISSN: 1367-0484
EISSN: 1476-5411
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