Ishihara test
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English
Etymology
Devised by Shinobu Ishihara, a professor at the University of Tokyo, who first published his tests in 1917.
Noun
Ishihara test (plural Ishihara tests)
- 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.