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Ishihara test

Ishihara test noun: 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.

ishihara test: a test for red-green color blindness, using a number of colored plates (Ishihara plates), each of...
Image: Shinobu Ishihara, Public domain, via Wikimedia Commons

Noun

Ishihara test (plural Ishihara tests)

  1. 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.
    • In order to check on a clinically derived impression of a greater incidence of color-blindness among psychotic patients, the Ishihara Test (5) was given to a group of patients at the Worcester State Hospital.1935 May, Mary S. Millard, David Shakow, “A NOTE ON COLOR-BLINDNESS IN SOME PSYCHOTIC GROUPS”, in The Journal of Social Psychology, volume 6, number 2, →DOI, →ISSN, page 252

Forms of Ishihara test

pluralIshihara tests

Origin of Ishihara test

Devised by Shinobu Ishihara, a professor at the University of Tokyo, who first published his tests in 1917.

Questions about Ishihara test

What does Ishihara test mean?
Ishihara test means 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.
What part of speech is Ishihara test?
Ishihara test is a noun.
What is the plural of Ishihara test?
The plural of Ishihara test is Ishihara tests.

Words near Ishihara test in the dictionary

  1. Ishigawa
  2. Ishigawas
  3. Ishihara
  4. Ishihara plate
  5. Ishihara plates
  6. Ishihara test
  7. Ishihara tests
  8. Ishiharas
  9. Ishii
  10. Ishiis
  11. Ishikari

Source and license

Adapted from Wiktionary: Ishihara test (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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