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KMID : 1159320230250030311
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Korean Journal of Vision Science
2023 Volume.25 No. 3 p.311 ~ p.320
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Correlation of Refractive Power and Tear Lens Thickness between Post-RGP Lens and Cornea
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Jung Yee-Rin
Kim Ki-Hong
Chu Byoung-Sun
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Abstract
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Purpose : This study aimed to measure the post-Rigid Gas Permeable lens (RGP) tear film thickness and its refractive power.
Methods : Twenty participants (23.02±1.89 years old) were enrolled. Each participant was prescribed three different Base Curves (BC) of RGP to induce different fitting patterns (alignment fit, flat fit, and steep fit). The tear film thickness using OCT and refractive power was measured.
Results : The average tear film thickness between post lens and cornea were 6.20±1.06 μm with the flat fit, 9.10±1.55 μm with the alignment fit, and 12.5±1.50 μm with the steep fit (F(2, 57)=103.05, p<0.010). The refractive power of the tear film was ?0.85±0.75 D with the flat fit, -0.48±0.85 D with the alignment fit, and +1.56±0.77 D with the steep fit (F(2, 57)= 53.71, p<0.010). According to the three fittings, there was a high correlation of r=0.58 between the thickness of the tear lens on the rear of the RGP lens and the cornea and the refractive power generated by the tear lens.
Conclusion : This study showed that alignment fitting requires minimum refractive power adjustment while steep fitting requires a more careful approach.
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KEYWORD
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Corneal curvature, Optical interference tomography, Over-refraction, Tear film thickness
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