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G. Rodriguez, J.M. Merayo-Lloves, OK Study Group; Effectiveness of Orthokeratology to Reduce Dependence of Glasses and Contact Lenses Wear and Modulate Refraction . Invest. Ophthalmol. Vis. Sci. 2003;44(13):3702.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose:To validate Orthokeratology (OK) with two specific contact lenses like a method to reduce dependence of glasses and contact lenses Methods:After an informed consent, 74 eyes from 37 subjects (mean age of 29 yrs, range 18 to 50) with myopia equal or less than 3.00D and astigmatism equal or less than 1.00D (mean refraction: sph=-1.92 D, cyl= -0.51, Uncorrected Visual Acuity (UCVA)=0.23) were fitted with OK lenses (Conoptica® and Lenticon®). Before study, 17 patients were contact lenses wears (soft= 15, RPG=4, PMMA=1). The lenses were worn during the day and removed during the night. Data were collected before and 3, 6, 9 and 12 months after treatment. UCVA and Refraction was measured after remove lenses. A questionnaire about satisfaction, quality of vision, comfort and easy handle was filled in each visit Results:Mean parameters of fitted lenses were R=8.48mm, Periphery band Closure= 4.5D, diameter=10.2mm, Refraction=1.5D. Lenses were worn a mean of 7.7 hours at 7 days per week. Only 6 patients ended study (follow-up= 12 months), 6 followed 9 months, 5 followed 6 months and 4 patients followed 3 months. 17 patients left study during the period of adaptation. One patient was taken out of study because of adverse event. Main reasons for left study were: bad VA (7 patients), discomfort (5) and unstable refraction (2). All patients who referred discomfort were soft contact lenses wears. In patients who followed in the study mean refraction after treatment was sph= -0.31D, cyl= -0.14D and UCVA=0.76. Satisfaction in these patients was good. In a scale of 1 to 10, patients pointed Comfort= 7.97, Quality of vision= 8.65 and easy handle= 9.13 Conclusions: Orthokeratology is an alternative method to reduce the dependence of use of glasses and contact lenses and modulate refraction in mild myopia. The most satisfied patients are those who don't wear contact lenses before or patient who wear RPG and who don't need a perfect Vision. However a great percentage of patients drop up of the study due to the strictly program of adaptation.
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