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KMID : 1011420210260030181
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Journal of Korean Ophthalmic Optics Society
2021 Volume.26 No. 3 p.181 ~ p.189
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Comparison of Corneal Aberration and Contrast Sensitivity for WTR-Astigmatism according to the Prescription Method of Soft Contact Lenses
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Seo Min-Kyeong
Park Chae-Im
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: This study aimed to investigate the effect of wearing toric soft contact lenses (hereinafter toric lenses) or soft lenses for spherical equivalent prescription (hereinafter spherical lenses) on corneal aberration and contrast sensitivity of astigmatism.
Methods: Seventeen WTR-astigmatism in their 20s with corneal astigmatism of > ?0.75 D were fitted with toric or spherical lenses, and their corneal aberration and contrast sensitivity were measured and analyzed according to pupil size. Their subjective satisfaction was also evaluated.
Results: Only when wearing toric lenses, significant decrease in corneal lower-order and total aberrations of WTR-astigmatism was observed compared with uncorrected eyes regardless of pupil size. On the other hand, higher-order aberration when wearing both lenses was statistically larger in 6 mm-pupil than uncorrected eyes. Spherical lenses tended to reduce the difference in corneal lower-order and total aberrations between astigmatic groups at 6 mm-pupil; however, when wearing toric lenses, the aberrations reduced compared with the uncorrected eyes, and the difference between the astigmatic groups at all pupil sizes was also decreased, but the largest in group III. Contrast sensitivity with toric lens wear was higher than the spherical lens wear, and the difference of contrast sensitivity from 5 cpd or higher was statistically significant; however, contrast sensitivity of group III significantly reduced from 5 cpd or higher regardless of prescription method. Higher satisfaction was observed for all subjective symptoms except stiffness when wearing toric lenses than spherical lenses.
Conclusions: From the results, it was confirmed that corneal aberration and contrast sensitivity varies by pupil size depending on axial correction when prescribing contact lenses for astigmatism, which affects the visual satisfaction of wearers. In addition, it was possible to present academic research evidence that it is not appropriate to evaluate vision quality at the corneal level with total high-order aberration when wearing back toric lenses.
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KEYWORD
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Toric soft contact lens, Spherical equivalent, Prescription method, Corneal aberration, Contrast sensitivity
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