![]() 1, presented here in black and white so that even the fully colorblind get a sense of how the test works. There are also Ishihara tests consisting of 10, 14 or 24 test plates, and plates in some versions ask the viewer to trace a line rather than read a number. The full test consists of 38 plates, but the existence of a severe deficiency is usually apparent after only a few plates. Other plates are intentionally designed to reveal numbers only to those with a red-green color vision deficiency, and be invisible to those with normal red-green color vision. Within the pattern are dots which form a number or shape clearly visible to those with normal color vision, and invisible, or difficult to see, to those with a red-green color vision defect. Each plate depicts a solid circle of colored dots appearing randomized in color and size. The test consists of a number of Ishihara plates, which are a type of pseudoisochromatic plate. It was named after its designer, Shinobu Ishihara, a professor at the University of Tokyo, who first published his tests in 1917. The Ishihara test is a color vision test for detection of red-green color deficiencies. ![]()
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