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Sho Yokoyama, Yoshiki Tanaka, Kazuo Ichikawa, Kiyoshi Tanaka, Hideki Nakamura, Shoko Tanabe; Temporal Characteristics of Color Visual Acuity in Young Normal Eyes. Invest. Ophthalmol. Vis. Sci. 2012;53(14):4820.
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© ARVO (1962-2015); The Authors (2016-present)
We developed a prototype of visual function testing device that uses colored Landolt Ring and background that has the capability of testing the color element of vision. This equipment can control the Landolt ring colors, directions of the break, their sizes, time duration of displays, and background colors to any desired values on the dedicated liquid crystal display (ColorEdge CG241W: Nanao Co). In this work, We evaluated the temporal characteristics of visual acuity using colored Landolt ring.
Six eyes of 6 volunteers (6 males) were enrolled in this study. The mean age was 23 years old (range 22-26 years). They had no history of ocular disease (including color anomaly) or surgery. All of them had best-corrected visual acuity (BCVA) 20/20 or better. We set the background color as white point of the standard light D65. We selected 4 colors (Red; R, Green Yellow; GY, Green; G, and Blue Purple; BP) of New Color Test (chroma 6 Munsell) as Landolt ring color. The luminance of these colors set approximately at the same value of 30 [cd/m2]. We measured each CVA (Color Visual Acuity; BCVA using colored Landolt Ring) that presentation time was set as 5.0, 3.0, 1.0, 0.5, 0.1 and 0.05[s]. Additionally the black and white Landolt ring (luminance contrast was about 100%) was tested as comparison. Each tested visual acuity was compared with that of 5[s] presenting time.
The longest presenting time that mean CVA was significantly worse compared with that of 5[s] presenting time in each color was as follows: Black and White was 0.1[s] (p<0.001), "R" was 0.5[s] (p<0.01), "GY" was 0.1[s] (p<0.001), "G" was 0.5[s] (p<0.01), "BP" was 1.0[s] (p<0.01) (Figure).
It was found that the color taking long time for recognition was BP. This result suggests that the S-cone’s time responce characteristic is less than the other cones (L, M-cone).
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