Long-term results orthokeratological therapy in patients with myopia
Abstract
Purpose
The potential impact of the peripheral refraction on the refractogenesis and development of myopia is validating for using orthokeratologicaltherapy to form a peripheral myopic defocus in patients with myopia. The purpose of the research was to study the long-term results of orthokeratologicaltherapy in patients with myopia.
Methods
21 patients (42 eyes) with myopia from -0.75 D to -4.5 diopters σ = (−2.35 ± 1.22) D, with average age (12.43 ± 6.09), used the night contact lenses Paragon CRT 100 were followed up for 3 years. Methods of examination included visometry, keratometry and refractometry after cycloplegy with Cyclomed 1% with using KR-8900, Topcon and HRK-7000, Huvitz; ultrasonic eye`s biometry with Desmin M (thickness of cornea and lens, depth of anterior chamber, length of vitreous) before and after 3 years using OK- therapy. We have used (patent Ukraine № 91371, 24.06.2014) coefficient K = ((AC+L/2)/(V+L/2)) × 100, AC - anterior chamber, L - thickness of lens, length of vitreous.
Results
The long-term results of orthokeratological therapy showed the positive effect to slow of the myopic process. After 3 years OK- therapy myopia was stabilized in 27 eyes (64.29%). The date 31 and more of coefficient K showed the refractive type of myopia and less then 31 - showed axial type of myopia. The refractive type of myopia was in 22 eyes (52.38%) and axial type of myopia was in 20 eyes (47.62%).
Conclusions
The most positive effect of orthokeratological therapy observed in patients with refractive component due to the curvature of the cornea. Coefficient have showed the type of axial or refractive myopia (Patent Ukraine № 83299U, 27.08.2013). The coefficient can be used for prognosis of progression myopia.
