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| Optical Quality and Contrast Sensitivity Visual Acuity of Peripheral Defocus Soft Lens in the Correction of Myopia |
| Yan Liu1, Guofu Chen1, Yi Jiang1, Wenwen Wang1, Chen Yu1, Jun Deng2 |
| 1Hangzhou Xihu Zhijiang Eye Hospital, Hangzhou 310024, China2Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China |
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Abstract Objective:To determine the imaging characteristics in myopic adults treated with peripheral defocus soft lens and further analyze its influence on optical quality and contrast visual acuity. Methods:This was a prospective before-after self-control clinical study. Twenty-nine patients (29 eyes) who wore peripheral defocus soft lenses in Hangzhou Xihu Zhijiang Eye Hospital were enrolled in this study. The age of the participants was 25.9±5.2 (19-38) years, and the myopic spherical equivalent (SE) was -3.80±1.34 D. The mean corneal curvature was 42.77±1.14 D, and the best corrected visual acuity (BCVA) was greater than 5.0. OPD-SCAN Ⅲ was used to detect wavefront aberrations corrected by peripheral defocus soft lens and spectacles within a 6 mm pupil diameter on the day of lens ftting. The objective optical scattering index (OSI)and modulation transfer function cutoff frequency (MTF cutoff) were measured by OQAS-II. Paired t-test and Wilcoxon signed-rank test were used in this study. Results:The spherical aberration, coma, trefoil aberration and total ocular higher-order aberration were significantly higher when undergoing peripheral defocus soft lenses than wearing spectacles (Z=-4.68, P<0.001;Z=-4.68, P<0.001;t=-6.48, P<0.001;Z=-4.68,P<0.001). When BCVAwas ftted in two different ways, MTF cutoff was signifcantly lower when wearing peripheral defocus soft lenses than spectacles (t=6.10, P<0.001). OSI was signifcantly higher when wearing earing peripheral defocus soft lenses (Z=-4.21, P<0.001). Conclusions:Peripheral defocus soft lenses can increase optical aberrations and decrease contrast sensitivity visual acuity, but BCVAremained unchanged. It is necessary to balance these effects when choosing peripheral defocus soft lenses for myopic patients.
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Received: 29 September 2022
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| Fund:Technology Planning Project of Hangzhou Science and Technology Bureau (B20200651) |
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Corresponding Authors:
Jun Deng, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China (dengjun2019@outlook.com)
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