pone.0260525.s001.mp4 (659.38 kB)
Demonstration of a red and a blue-purple Landolt ring displayed sequentially in the color visual acuity (CVA) testing system.
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posted on 2021-11-29, 18:40 authored by Sho Yokoyama, Yoshiki Tanaka, Takashi Kojima, Rie Horai, Yukihito Kato, Hideki Nakamura, Hiroyuki Sato, Mari Mitamura, Kiyoshi Tanaka, Kazuo IchikawaThe colored Landolt ring is presented with its gap in one of four directions: up, down, right, or left. If the subject answers correctly, the stimulus size is reduced by one step. If the answer is incorrect or not supplied, the stimulus size is increased by one step. The CVA value is calculated from the minimum Landolt ring size for which the subjects answer correctly more than two times out of a maximum of five times.
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white point d65statistically significant differencescorrected visual acuity60 – 69379 ± 0339 ± 0335 ± 0333 ± 0324 ± 0303 ± 030 – 3920 – 29162 normal eyesnine cva valuesmean cva valuesnew color testcolor visual acuitycva values related2 >< 0≥ 2030 cd162 subjectscva valuec xlink ">stimulus sizesensitive conesremaining sixrelated changesrelated changeprevious reportsnegatively correlatedminimum anglelandolt “<following groupsfifteen colorschroma 615 colors096 ),05 );
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