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KMID : 1159320180200020129
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Korean Journal of Vision Science
2018 Volume.20 No. 2 p.129 ~ p.136
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A Study on the Change of Contrast Visual Acuity According to the Types of Functional Spectacle Lens for Driving and illumination
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Koh Kyung-Ho
Jeon In-Chul
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Abstract
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Purpose : The purpose of this study is to investigate the change of visual function under photopic and scotopic conditions according to the type of functional driving lenses.
Methods : Thirty patients (mean age 25 ± 2 years) who have no general or ocular disease were recruited. Corrected Visual acuity (VA) of participants who have no ocular surgery history should be 1.0 or better bilaterally. They were asked to wear three different types of functional lenses (A, B, C lens) and one general lens (N lens, refractive index 1.60). Visual acuity (logMAR) was measured using the contrast chart and a trial frame for correction. The contrast VA was measured under 100%, 50%, 30% and 15% contrast under both photopic and scotopic conditions, and color vision test (Compact Magnetic Farnsworth Dichotomous D-15 array test) and vision recovery time with automobile head light were measured. Pre- and post-satisfaction with each functional lens is measured under the same environment. Data were analyzed by paired sample t-test using SPSS (Ver. 22.0 for Windows, SPSS Inc, USA) and ≥95% reliability was considered statistically significant.
Results : Contrast VA with 3 types of functional lens was statistically significant 100%, 50%, 15% contrast under photopic condition, and 100%, 50%, 30%, and 15% contrast under scotopic condition, respectively. However, in 30% contrast under photopic condition it was not shown significant. Contrast VA under photopic condition was the highest with C lenses (logMAR 0.002) at 100% contrast, C lenses (logMAR 0.005) at 50% contrast, B lenses (logMAR 0.015) at 30% contrast, and B lenses (logMAR 0.015) at 15% contrast. Contrast VA in scotopic condition was the highest with B lens (logMAR 0.006) at 100% contrast, B lens (logMAR 0.009) at 50% contrast, C lens (logMAR 0.019) at 30% contrast, and B lens (logMAR 0.052) at 15% contrast. In D-15 test, the mean number of lines crossing with A lens was 6.05 ± 1.7 and no lines crossing with N, B, and C lens was found. Visual recovery time was statistically significant in the order of C lens>B lens>A lens under photopic, and A lens>C lens>B lens under scotopic condition (p<0.05).
Conclusions : Compared to the normal lens, the driving lens was effective in increasing contrast visual acuity and reducing visual acuity recovery time. However, in the D-15 test color confusion occurred only in the A lens (yellow lens). In order to select a lens that is helpful to the night vision driver's vision, the manufacturer should offer the lens manufacturing method and the correct use of each lens.
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KEYWORD
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Electrochromic, Smart glass, Percolation, Sol-gel process, Spin coating
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FullTexts / Linksout information
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Listed journal information
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