Ishihara colour blindness test, London, England, 1948

Made:
1948 in London

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Ishihara colour test with instructions, published by H.K. Lewis and Co. Ltd., English, 1948

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.

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Details

Category:
Ophthalmology
Object Number:
A662609
Materials:
card, paper
type:
colour blindness test
taxonomy:
  • visual and verbal communication
status:
Loan: Wellcome Trust

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