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KMID : 1159320080100010047
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Korean Journal of Vision Science
2008 Volume.10 No. 1 p.47 ~ p.61
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The effects on the myopic reduction according to change of diameter in Orthokeratology contact Lenses
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Oh Hyun-Jin
Kim Mi-Young
Buyn Jang-Won
Nam Sang-Hoon
Eom Jung-Hee
Mah Ki-Choong
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Abstract
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Purpose: To compare and analyze that the effects of change in diameter of orthokeratology contact lens has on myopic reduction.
Methods: 41 eyes(male 19 eyes, female 22 eyes, mean 22.7±3.1 yrs.) were fitted with overnight orthokeratology contact lens with three different diameters(10.0 mm, 10.6 mm and 11.2 mm) and examined before wearing and on the 7th day after wearing. Subjective refraction, autorefraction, Orbscan topography/pachymetry and slit lamp examinations were performed at each session.
Results: In the three type of lenses, there were no significant differences in improvement of unaided visual acuity and in reduction of refractive error and astigmatism measured by subjective refraction. But the reduction of myopia measured by autorefractometer were greater in the lens with larger diameter(F = 12.7, p < 0.05). The change in mean K-reading measured by autokeratometry were greater in the lens with larger diameter(F = 47.7, p < 0.05). There was no significant correlation in the corneal astigmatism and the astigmatism measured by subjective refraction.
Conslusion: The change of diameter was considered to improve fitting characteristics and myopic reduction of Orthokeratology contact lenses. But further studies are required to fully understand the influence of these variables on the fitting process for solving clinical problems.
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KEYWORD
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orthokeratology, change of diameter, myopic reduction
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