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KMID : 1011420160210010053
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Journal of Korean Ophthalmic Optics Society
2016 Volume.21 No. 1 p.53 ~ p.59
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Phoria Changes Caused by Lens Adaptation after Wearing of Horizontal Prism Lens and Spherical Lens
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Lee Min-Jae
Kim Sang-Yeob
Wee Sung-Hyun
Moon Byeong-Yeon
Cho Hyun-Gug
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Abstract
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Purpose: To investigate an individual phoria compensating effect by measuring the lens adaptation after wearing horizontal
prism or spherical lenses at near.
Methods: 103 subjects (63 males and 40 females) aged 22.43±2.07 years participated for this study. Refractive errors of subjects were fully corrected, and subjects were classified into three groups; esophoria, orthophoria and exophoria. The adaptation test of prism and spherical lenses was performed immediately, 15 minutes and 30 minutes after wearing lenses with OU 2 ? BO and S+1.00 D for an esophoria group and OU 2 ? BI and S-1.00 D for orthophoria and exophoria groups, respectively. Each measured phoria was compared to phoria measured with fully corrected condition, and the phoria changing effects about both lenses was analyzed.
Results: The mean of phoria by prism lenses significantly decreased for every group. The mean of phoria by spherical lenses also significantly decreased in orthophoria and exophoria groups. The esophoria group showed a decreasing tendency but has no significance. The decreased phoria value by prism lens was classified into three steps; 90~100%, 0~10% and 50% or more. According to results of individual distribution ratio, it was 5, 64 and 24 subjects at 30 minutes after wearing lenses, respectively. The decreased phoria value by spherical lens was classified into three steps; 90~100%, 0~10% and 50% or more. According to results of individual distribution ratio, it was 37, 53 and 41 subjects at 30 minutes after wearing lenses, respectively. The subjects having no phoria changed by both prism and spherical lenses were 37.9%.
Conclusions: When prescribing to compensate the near horizontal phoria using prism or spherical lens, the pretest for lens adaptation should be taken before prescription.
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KEYWORD
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Phoria, Decreased phoria value, Prism adaptation, Spherical lens adaptation, Adaptation pretest
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