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The Ishihara Color Vision Test

In the early days the Ishihara Color Vision Test was the most widely used screening test for
The most widely used screening test for color blindness is the Ishihara Color Vision Test. The test is named after Japanese ophthalmologist Shinobu Ishihara (1879-1963), who devised the procedure and first published a description of it in 1917.

Consisting of a booklet, the Ishihara Color Vision Test features each page containing a circular pattern (or "plate") comprising many dots of various colors, brightness and sizes. The seemingly random colored dots are arranged in such a fashion that a person with normal color vision will see a single-digit or two-digit number within the array of dots, while a colorblind person will either be unable to see a number or will see a different number than the one seen by a person with normal color vision.

Labels: color blind tests

 

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