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KMID : 1011420210260030171
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Journal of Korean Ophthalmic Optics Society
2021 Volume.26 No. 3 p.171 ~ p.179
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Correlation between Corneal Aberrations and Recovery after Axis Rotation of Toric Soft Contact Lenses
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Hwang Min-Jun
Kim Do-Kyun
Park Mi-Jung
Kim So-Ra
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Abstract
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Purpose: Changes in corneal aberration based on the degree of axial misalignment during recovery after axial rotation of toric soft contact lenses (hereinafter toric lenses) were investigated in the present study.
Methods: Thirty-nine myopic eyes with a total astigmatism of ?0.75 D or higher were fitted with back toric lenses with a double thin zone for axis stabilization, which were rotated by 30±5° in the temporal direction. After that, the returning pattern of the axis was observed every 10 s for 150 s, and corneal total lower-order, and higher-order aberrations were measured and analyzed based on pupil size and astigmatic degree.
Results: The average recovery time of the toric lenses was 90.77±40.29 s (min. 30 s~max. 150 s). The increased corneal aberrations due to axis rotation decreased with axial recovery, with a decrease in corneal total, lower-order, and higher-order aberrations of 3.31%/°, 3.41%/°, and 3.00%/° at 4 mm pupil, 3.17%/°, 3.25%/°, and 3.50%/° at 6 mm pupil being observed, respectively. The recovery speed of corneal aberrations was fastest when the axis of toric lenses recovered by 1° in the moderate astigmatic group when analyzed based on the astigmatic degree.
Conclusions: The correlation between axis recovery after axial rotation and a reduction in corneal aberration was elucidated in the present study. The results also indicated that increased astigmatism was correlated with increased aberrations due to axis rotation and recovery. Therefore, it can be inferred that rapid axis recovery should be considered in addition to minimizing axis rotation to improve vision correction and visual satisfaction when wearing toric lenses.
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KEYWORD
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Toric soft contact lenses, Corneal aberrations, Axis misalignment, Recovery speed, Astigmatic degree
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