[ish-ee-hahr-uh] 
| 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. |
Ishihara test Ish·i·ha·ra test (ĭsh'ĭ-hä'rə)
n.
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.