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KMID : 1159320150170030259
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Korean Journal of Vision Science
2015 Volume.17 No. 3 p.259 ~ p.265
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The Changes of Visual Acuity According to Tinting Concentrations of Sunglasses Lenses
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Kim Heung-Soo
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Abstract
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Purpose: To identify the changes of visual acuity and retina’s contrast sensitivity according to tinting concentrations of sunglasses lenses.
Materials and Methods: The subjects of experiment were 30 university students who were older than 19 and younger than 25. (60 eyes) In addition, none of them had any ocular disease and their unaided visual acuity were above 0.7. Examination of visual acuity was done by using Chart of Landolt’s ring of 5m in the laboratory in which intensity of illumination was 80cd/㎡. Monocular vision acuity examination was also carried out with changing tinted concentration of either brown color lenses or gray color lenses at the rate of 80%, 60%, and 40% respectively. Furthermore, contrast sensitivity test was executed by using F.A.C.T.(Functional Acuity Contrast Test., Stereo Optical, USA).
Results: Visual acuity of the subjects without tinted lenses were better than those of the subjects with tinted lenses. As tinted concentration came to be darker, visual acuity became worse(P=0.000). In the case of gray lenses of 80% tinted concentration, the subjects’ visual acuity decreased by 0.28±0.03 compared to the case of not wearing tinted lenses. Similarly, in the case of brown lenses with same condition, their visual acuity decreased by 0.28±0.04. Moreover, the contrast sensitivity test using F.A.C.T. illustrated that lenses of 80% tinted concentration did not reach normal range at
all of cycles per degree, and lenses of 60% tinted concentration did not reach normal range at all of cycles per degree except at 1.5 cpd, and lenses of 40% tinted concentration did not reach normal range at cycles per degree above 6 cpd. For both gray lenses and brown lenses, Contrast sensitivity was significantly reduced at all of cycles per degree except at 1.5 cpd.
Conclusion: Since tinted concentration of lenses for any sunglasses is currently decided by aesthetic elements, possible damages at visual acuity and decrease of contrast sensitivity and tinted concentration in accordance with usage of sunglasses should be essential elements at any time of prescription and optometric dispensing of sunglasses.
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KEYWORD
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sunglasses, tinted lens, tinted concentration, contrast sensitivity
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