Ishihara test

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A popular test for the detection and characterization of colour-blindness or colour deficiency, consisting of a series of coloured plates each composed of small blobs of different colours closely packed together, each plate having a large numeral clearly visible to viewers with normal colour vision but invisible to those with a form of colour deficiency associated with that plate, the pattern of responses across the complete set of plates enabling the form of colour deficiency to be specified reasonably precisely. See also pseudo-isochromatic. Compare Holmgren test, Stilling test. [Named after the Japanese ophthalmologist Shinobu Ishihara (1897–1963) who devised it]

Subjects: Psychology.

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