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KMID : 1159320080100020131
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Korean Journal of Vision Science
2008 Volume.10 No. 2 p.131 ~ p.146
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The Comparative Analysis of High Order Aberration with Orthokeratology Contact Lenses of Different Diameter
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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 analyze high order aberrations according to the diameter of the orthokeratology contact lens worn.
Methods: 19 healthy individuals (mean age 23.2±3.5 yrs., male 6 and female 13 eyes) with no eye disease were each fitted with orthokeratology contact lenses of 3 different diameters (10.0 mm, 10.6 mm and 11.2 mm). Autokeratometry, subjective refraction, and aberrometry (Zywave, B&L, USA) were performed before wearing the contact lens and 7 days after wearing the contact lens.
Results: There were no statistically significant differences in total aberration (RMS or high order aberration RMS) in the 6 mm zone for the three different OK lens diameter groups. The off-X axis coma aberration and the off-Y axis coma aberration were not significantly different. Also, the off-X axis trefoil aberration and the off-Y axis trefoil aberration were not significantly different between lens diameter groups. There were no statistically significant correlations between total aberration (RMS), HOA RMS and improvement in visual acuity. There were significant correlations between change of on-axis spherical aberration in HOA and change of flatter K-reading by wearing 10.0 mm and 10.6 mm OK lenses. There were significant correlations between change of on-axis spherical aberration in HOA and reduction of refractive error by wearing 10.6 mm and 11.2 mm OK lenses. There were significant correlations between change of off-X axis coma aberration and improvement of visual acuity by wearing 10.0 mm (r = 0.468, p = 0.043) and 11.2 mm (r = -0.523, p
= 0.021) OK lenses.
Conslusions: RMS and HOA RMS varied according to the diameter of the Orthok contact lens fitted, but improvement in visual acuity was not significantly correlated with the diameter of lens worn. There were correlations between spherical and X axis coma aberration and reduction of refractive error and improvement of visual acuity according to diameter change of OK lens.
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KEYWORD
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Orthokeratology Contact lens, Aberration, Diameter
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