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The Ishihara test is a color vision test for detection of red–green color deficiencies. It was named after its designer, Shinobu Ishihara, a professor at the University of Tokyo, who first published his tests in 1917. [2] The test consists of a number of Ishihara plates, which are a type of pseudoisochromatic plate.
An Ishihara test image as seen by subjects with normal color vision and by those with a variety of color deficiencies. A pseudoisochromatic plate (from Greek pseudo, meaning "false", iso, meaning "same" and chromo, meaning "color"), often abbreviated as PIP, is a style of standard exemplified by the Ishihara test, generally used for screening of color vision defects.
The Ishihara color test is the test most often used to detect red–green deficiencies and most often recognized by the public. [1] Some tests are clinical in nature, designed to be fast, simple, and effective at identifying broad categories of color blindness. Others focus on precision and are generally available only in academic settings. [56]
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Cerebral achromatopsia can be diagnosed easily with color vision tests, commonly the Farnsworth-Munsell 100 hue test or the Ishihara plate test. [2] Testing and diagnosis for cerebral achromatopsia is often incomplete and misdiagnosed in doctor's offices. [4]
The commonly used Ishihara test is used to detect mainly congenital red-green color blindness, but its usefulness is limited in detecting acquired color vision deficiencies. [3] But City University test contains test plates that can be used to detect all types of color vision deficiencies. [4]
The Plate No. 19 presented here does not correspond to standard Ishihara Test. In this image, a person with normal vision can see clearly "2", and a person with color blind to red/green may not see anything.
Shinobu Ishihara (石原 忍, Ishihara Shinobu, September 25, 1879 – January 3, 1963) was a Japanese ophthalmologist who created the Ishihara color test to detect colour blindness. He was an army surgeon .
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