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KMID : 1159320210230010129
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Korean Journal of Vision Science
2021 Volume.23 No. 1 p.129 ~ p.138
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Effect of Wearing Different Soft Contact Lens Material & Base Curve on the Objective Refraction
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Jung Yee-Rin
Chu Byoung-Sun
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Abstract
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Purpose:The study investigated the effect of different soft contact lens material & Base curve on over-refraction using ARK and corneal topography measurement.
Methods:20 participants with mean corneal curvature of 7.77±0.24mm (mean age=24.73 ±2.52 years) volunterred. Each participant worn ?3.00D of hydrogel contact lenses and silicone hydrogel lenses with BC 9.0 mm & 8.5 mm in random order. The refraction (KR-8100P) and corneal topography measurement (Oculus Keratograph 5M) were conducted and difference of before and while wearing the lenses were analysed after ?3.00 D compensation.
Results:There were no statistically significant for ARK and topography measurmenet among 4 lenses (ARK p=0.691, Topography p=0.438). Differences by material were 0.05±0.05 for hydrogel and 0.12±0.04 for silicone hydrogel (p=0.327). Difference by BC were 0.06±0.05 for BC 9.0 and 0.11±0.05 for BC 8.5 (p=0.482). For Topography measurement, differences by material were 0.30±0.05D for hydrogel and 0.38±0.05D for silicone hydrogel (p=0.298). Difference by BC were 0.36±0.04D or BC 9.0 and 0.32±0.06D for BC 8.5 (p=0.537).
Conclusion: Material and BC did not make any difference on the objective refraction, however corneal topography showed more than 0.25 D map changes, therefore cautious approaches needs to be made when prescribing contact lens.
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KEYWORD
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Autorefractor, Base curve, Corneal topography, Hydrogel lenes, Silicone hydrogle lenses
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