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KMID : 1036620160040040662
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Journal of Korean Clinical Health Science
2016 Volume.4 No. 4 p.662 ~ p.670
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The Correlation Between Corneal Eccentricity and Radius Curvature by Fitting Status of Soft Contact Lens Wearer
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Han Sun-Hee
Kim Bong-Hwan
Park Jun-Sung
Baek Su-Won
Kwon Sung-Jin
Kim Eun-Kyoung
Yoon Jung-Na
Choi So-Min
Heo A-Jeong
Park Eun-Hye
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Abstract
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Purpose. Because of a recent increase in use of soft contact lens at younger ages, in the present study, the correlation between corneal eccentricity and radius of curvature and fitting types of contact lens was investigated.
Methods. The study evaluated the fitting status of targets through lens centration, push-up test, dynamic lag test and static lag test of lenses usually worn by 49 men and women (98eyes) in their 20s to 30s who put on soft contact lenses. After evaluation, the subjects were classified into 3 categories by fitting status(steep, aligment and flat). The radius of corneal curvature in the naked eyes was measured by using keratometer. Moreover the corneal eccentricity in the nasal side, temporal side, superior side and inferior side was measured by using the device capable of measuring the corneal eccentricity.
Results. The radius of corneal curvature and corneal eccentricity of soft lenses worn by subjects were higher in the order of steep fitting and flat fitting, and the higher average corneal curvature radius and corneal eccentricity is intend to be more steep fitting(p=0.051, p=0.052). The corneal eccentricity showed a tendency to nasal fitting type at the higher eccentricity and temporal fitting type at the smaller eccentricity, statistically significant difference was observed(p<0.05). The study
showed there were low correlation that nasal and temporal side at steep fitting, superior side at nor-mal fitting and 4side(nasal, temporal, superior, inferior) at flat fitting, therefore when the corneal eccentricity changed the radius of corneal curvature also changed. The corneal eccentricity and the radius of corneal curvature showed statistically significant difference at 4side and each fitting types(p<0.05).
Conclusions. The results of this study, the fitting status, of wearer are based on radius of corneal curvature and corneal eccentricity, and if lens fitting would be done considering that, it seems to be useful in a soft contact lens prescription.
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KEYWORD
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Corneal eccentricity, Lens fitting type, Radius of curvature, Soft lenses fitting
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