Ishihara test

or Ish·i·ha·ra's test

[ ish-ee-hahr-uh or ish-ee-hahr-uh z ]
/ ˌɪʃ iˈhɑr ə or ˌɪʃ iˈhɑr əz /

noun Ophthalmology.

a test for determining color blindness by means of a series of cards each having colored dots that form one pattern to the normal eye and a different pattern to the eye that is color-blind.


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Origin of Ishihara test

1920–25; named after S. Ishihara (1879–1963), Japanese eye specialist, who devised it Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Medical definitions for ishihara test

Ishihara test
[ ĭsh′ĭ-härə ]


A test for color-vision deficiency employing a series of plates on which numbers or letters are printed in dots of primary colors surrounded by dots of other colors; the figures are discernible by individuals with normal color vision.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.