Ishihara test

English thumb|Ishihara test plate showing the number 74. People with red-green color blindness may see the number 21. People with monochromatic vision may not see a number at all. Etymology Devised by Shinobu Ishihara, a professor at the University of Tokyo, who first published his tests in 1917. Noun A test for red-green color blindness, using a number of colored plates (Ishihara plates), each of which contains a circle of dots of various colors and sizes. Depending on the person's vision, certain dots within the pattern will appear to form recognizable numbers or shapes. en May 1935 Mary S. Millard; David Shakow A NOTE ON COLOR-BLINDNESS IN SOME PSYCHOTIC GROUPS 10.1080/00224545.1935.9921640 The Journal of Social Psychology 0022-4545 6 2 252 In order to check on a clinically derived impression of a greater incidence of color-blindness among psychotic patients, the Ishihara Test (5) was given to a group of patients at the Worcester State Hospital. en eponyms