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KMID : 1159320070090010103
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Korean Journal of Vision Science
2007 Volume.9 No. 1 p.103 ~ p.113
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The errors of subjective and objective refraction at over-refraction of contact Lenses prescribed by spherical equivalent
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Lee Dong-Yeol
Hwang Hye-Kyung
Mah Ki-Choong
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Abstract
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In order to evaluate the availability of auto-refractometer that determines corrective power of contact lens in the process of over-refraction, 40 people(23 males, 17 females, total 80 eyes, the average age 24.6±2.9 with corrected visual acuity over 20/20 and the history of wearing contact lens) have been tested in subjective refraction, auto-refraction both without wearing contact lens and with wearing 5 different types of contact lenses. Contact lens power was determined in consideration of calculation for correction of vertex distance and spherical equivalent power in cases of that the corrective power was over ±3.00D and astigmatism.
In over-refraction by subjective refraction and auto-refraction with wearing 5 different types of contact lens, the difference of a measured values between subjective refraction and auto-refraction was significantly different in spherical power of one-day soft contact lens(p < 0.001) and RGP contact lens(p < 0.001), and in spherical equivalent of RGP contact lens(p < 0.01). But all differences were not clinically significant and were similar to them of in case of non-wearing contact lens.
From these results, it is suggested that auto-refractometer should be useful in the process of over-refraction for determining the corrected power prescription of contact lens because the measured data were not different compared to them of subjective refraction.
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KEYWORD
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Auto-refractometer, Subjective refraction, Objective refraction, Spherical equivalent, Over-refraction
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