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Sho Yokoyama, Kazuo Ichikawa, Hideki Nakamura, Shoko Tanabe, Yoshiki Tanaka, Kiyoshi Tanaka, Rie Horai; A Color Visual Function Test to Evaluate the Age-Related Changes in Good Visual Acuity of Normal Eyes. Invest. Ophthalmol. Vis. Sci. 2013;54(15):3018.
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© ARVO (1962-2015); The Authors (2016-present)
Color Visual Acuity (CVA) is the visual acuity that measured from colored Landolt ring on the background of achromatic color and that is the measure for evaluation of visual function for colors in daily life. From ARVO of 2012, we measured the subjects of best corrected visual acuity (BCVA) 20/20 or better of normal eyes in each generation to examine the CVA and we noticed particularly in Red-Green axis color of CVA had negative correlation with age. However, target group of BCVA has already accepted the negative correlation with age, so that in comparison with the conventional Landolt ring, we were not able to fully grasp the significance correlation with CVA and age. Therefore, this time we intended for only BCVA 20/13 of normal eyes and again to examine the correlation of CVA and age-related changes.
One hundred thirteen normal eyes of 131 subjects were enrolled in this study. The mean age was 39 years old (range 16-80 years). They had no history of ocular disease (including color anomaly) or surgery. All of them had the BCVA 20/13. We set the background color as white point of the standard light D65 and Landolt ring colors with fifteen colors using the New Color Test (Luneau Ophtalmologie, Paris). The luminance of background and Landolt Ring is both set approximately at the same value of 30[cd/m2]).We measured all CVA of fifteen different colors for each subjects (Figure).
The results of the negative correlation with age are shown in the descending orders GB, G, R, YR, YG, RY, BG, B, PR, P and RP. In contrast the results of no correlation were Y, GY, PB and BP (linear regression analysis: significance level P<0.05).
The subject group of the BCVA 20/13, even in the normal subjects with good visual acuity, depending on colors, the CVA decreased with increasing age.
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