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KMID : 1159320210230030271
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Korean Journal of Vision Science
2021 Volume.23 No. 3 p.271 ~ p.282
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The Impact of Different Types of Soft Contact Lenses on Over-Refraction and Corneal Topography Measurement When Fitted on Flat Cornea after Refractive Corneal Surgery
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Jung Yee-Rin
Park Hyung-Min
Chu Byoung-Sun
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Abstract
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Purpose : This study investigated that wearing different types of soft contact lenses on flat cornea could impact on the measurement of over-refraction using Autorefractokeratometer(ARK) and corneal topography.
Methods : Twenty participants with average cornea curvature of 8.40±0.20 mm (23.38±2.65 years) participated. Each participant worn ?3.00 D of two different Base Curve (BC, 8.5 mm and 9.0 mm) and two different materials (hydrogel and silicone hydrogel lenses). Over-refraction (KR-8100P) and corneal topography measurement (Oculus Keratograph 5M) were conducted.
The amount of changes was analyzed based on the refractive error before wearing after correcting the power of the worn lens.
Results : Among 4 types of lenses used in the study, there was no statistical difference in ARK measurement (p=0.293), while there was statistical difference in topography measurement (p<0.001). For over-refraction with ARK, the difference in BC 9.0 and BC 8.5 (p=0.420) was 0.16±0.04 D and 0.19±0.04 D, respectively. Difference in hydrogel material and hydrogel materials (p=0.064) was 0.12±0.04 D and 0.23±0.04 D, respectively. For topography changes, the difference in BC 9.0 and BC 8.5 (p=0.393) was 0.36±0.01 D and 0.34±0.01 D, respectively.
Difference in hydrogel material and silicone hydrogel materials was 0.32±0.01 D and 0.39±0.01 D, respectively, showing statistically significant difference between materials (p<0.001).
Conclusion : Theoretically, fitting soft contact lenses on the flat cornea may influence the over-refraction results due to misalignment between cornea and contact lenses. However, the latest soft contact lenses with low modulus showed well-aligned with cornea. Therefore, when fitting soft contact lenses on the flat cornea, discomfort due to lens movement needs to be carefully monitored. However, a similar effect of refractive correction would be expected compared to when fitting on a normal corneal shape.
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KEYWORD
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Autorefractor, Base curve, Corneal topography, Hydrogel lenes, Silicone hydrogel lenses
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