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Ishihara colour blindness test, London, England, 1948

Science Museum, London


Free to use with attribution CC BYCredit: Science Museum, London
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Used to test for colour blindness, this test is named after its inventor, Shinobu Ishihara (1897–1963), a Japanese ophthalmologist. Each image is made up of a series of closely packed coloured dots and includes a number. The patient is asked to identify the number or image that they can see. By using the range of charts, the type of colour blindness a patient has can be identified. There are three types of colour blindness: daltonism – inability to distinguish reds from greens (the most common type); monochromatism –where all colours appear as shades of one colour; and total colour-blindness. Ishihara devised his test in 1917 and is still used today. publisher: H. K. Lewis & Company Limited Place made: London, Greater London, England, United Kingdom


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Ishihara colour blindness test, London, England, 1948. Credit: Science Museum, London. CC BY

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