Ishihara Test

The Ishihara Color Test is an example of a color perception test for red-green color deficiencies. It was named after its designer, Dr. Shinobu Ishihara, a professor at the University of Tokyo, who first published his tests in 1917. (from wikipedia)

Example of an Ishihara color test plate. The numeral “74” should be clearly visible to viewers with normal color vision. Viewers with dichromator anomalous trichromat may read it as “21”, and viewers with achromat may see nothing. (from wikipedia)

Ishihara plate number 13 (the image visible is a number six)

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