/ish'ee hahr"euh/ , Ophthalm.
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.
Also, Ishihara's test .
[ 1920-25; named after S. Ishihara (1879-1963), Japanese eye specialist, who devised it ]