Color perception test

The Ishihara color plates are used to detect red-green color blindness or (much rarer ) yellow-blue color blindness. Developed and later they were named after the Japanese ophthalmologist Shinobu Ishihara, this test first described in 1917.

The test is performed with a disk are disposed on the round spots of color in different shades and sizes. Persons with normal Farbsehfähigkeit it can read numbers or letters, while subjects with a color weakness difficulties with it or do not. Typically, the test several color plates must be considered. Thus, it is possible to estimate the degree of color weakness. From a red-green color blindness ( protanomaly, Deuteroanomalie ) about 8-9 % of all men (ie about one under 11 ) and about 0.5-0.8 % of women (about one under 130-200 ) in Western countries affected. The blue-yellow color blindness ( Tritanomaly ), however, is very rare (less than 1 less than 10,000 ). If they have a low level, the red-green color blindness falls in everyday practice does not occur and the victims are confronted for the first time so when considering the Ishihara plates. Certain professions, which require critical to good vision (eg pilot ), but are not possible for people with a clear color color blindness.

Colour Plate 11 (6 )

Color chart (deposited No number, some people with red-green weakness detect a 2) 19

Color Plate 23 (42 )