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Hiroshi Uozato, Masatsugu Kanazawa; Influence of glare light on contrast sensitivity through absorptive lenses. Invest. Ophthalmol. Vis. Sci. 2013;54(15):584.
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To investigate the influence of glare light in peripheral visual field on the contrast sensitivity (CS) through absorptive lenses under photopic and mesopic vision.
The subjects were 13 healthy volunteers and accepted CS measurement. Its measurement was performed to use a contrast glare tester, CGT-2000 (TAKAGI SEIKO), under photopic (background brightness: 100 cd/m2) and mesopic vision (background brightness: 10 cd/m2). Intensities of glare light which was indicated on 12° were glare M (brightness: 40,000 cd/m2) or glare H (brightness: 100,000 cd/m2). Binocular CS without glare light was compared with glare M and glare H. The effect of absorptive lenses was analyzed for wavelength component: cone’s peak wavelength value through absorptive lenses. We defined S-, M- and L- cone’s peak wavelength value as S-, M- and L- wavelength components and calculated correlation coefficients between contrast sensitivity and wavelength components. Absorptive lenses were RETINEX (HOYA, CO., JAPAN) with 5 colors: Orange - Brown (OB: luminous transmittance (LT), 12%), Orange (OR: LT, 49%), Red (RE: LT, 33%), Yellow (YE: LT, 77%), Yellow - Brown (YB: LT, 29%).
Compared with CS without glare light, there was no change between CS with glare light under photopic vision. CS, however, decreased with glare H under mesopic vision (ANOVA, Scheffé, p < 0.05). In the analysis of a correlation coefficient, L and M wavelength components effectively contribute to contrast sensitivity under photopic vision. Correlation coefficients of each wavelength component showed almost the same values under mesopic.
We suggest that binocular CS decreases in the case of the highest intensity of glare light in peripheral visual field under mesopic vision. Absorptive lenses are especially useful in daylight because color lenses which absorb short-wavelength hardly affect CS under photopic vision.
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