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KMID : 1011420210260030161
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Journal of Korean Ophthalmic Optics Society
2021 Volume.26 No. 3 p.161 ~ p.170
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Changes in Corneal Aberrations with Axial Rotation of Toric Soft Contact Lenses
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Hwang Min-Jun
Kim Do-Kyun
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: In this study, the effect of changes in corneal aberrations when wearing toric soft contact lenses (hereinafter toric lenses) and the effect of axial rotation of toric lenses on optical correction were investigated.
Methods: A total of 41 myopic WTR-astigmatic eyes of patients in their 20s were included in this study, excluding those with monocular visual acuity <0.8, or axial rotation >5° when wearing a toric lens with a double-thin design for axis stabilization. The corrective effect was determined by measuring total, lower-order, and higher-order aberrations of the corneas before and after wearing the toric lens, after which the change in aberration was measured after rotating the lenses by 30±5°.
Results: Corneal total and lower-order aberrations were significantly reduced when wearing toric lenses, and the aberration increased again when the axis was rotated. In particular, in the high astigmatism groups, the corneal aberrations were of almost the same level as before wearing the toric lens, indicating the most significant reduction in the corrective effect of the contact lenses. In addition, despite wearing toric lenses, the corneal higher-order aberration significantly increased, and its degree was greater during axial rotation. As the pupil size increased from 4 mm to 6 mm, all corneal aberrations increased by more than double the for each measurement.
Conclusions: This study revealed that axial rotation of the toric lens causes significantly larger corneal aberrations than those at the axis stabilization, and the degree of change increases as the astigmatism increases. Therefore, when the wearer’s degree of astigmatism is high, the wearer's vision-related habits for minimizing axial rotation as well as considering the fit and design of toric lenses, may be essential to obtain high visual satisfaction.
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KEYWORD
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Toric soft contact lenses, Axial rotation, Corneal total aberration, Corneal lower-order aberration, Corneal higher-order aberration
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