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Indian Scientific Instrument

Ishihara Plates

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Ishihara plates are the part of Ishihara Color Test, which is done for checking the deficiencies of red-green color. The name of test comes from its designer, Dr. Shinobu Ishihara, who is a professor at the University of Tokyo. In 1917, he published his tests and since then these have become a common part of eye care and treatment all around. The complete Ishihara Color Test consists of 38 Ishihara Plates whereas its smaller version includes 24 plates. The Ishihara Plates have a circle of dots that appear in haphazard colors and sizes. Amidst this circle, there are dots that make up a shape or number. People having the red-green color vision defect either face difficulty in seeing the pattern or fail completely to recognize it.

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