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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.
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 .
An Ishihara test image as seen by subjects with normal color vision and by those with a variety of color deficiencies. The main method for diagnosing a color vision deficiency is in testing the color vision directly. The Ishihara color test is the test most often used to detect red–green deficiencies and most often recognized by the public. [1]
In the full 38 plate test it is found as plate 29, often rotated 180 degrees from what is shown. Gsuberland ( talk ) 13:06, 29 June 2021 (UTC) [ reply ] This appears to be the only plate referred to by this article that uses the 24 plate numbering, so I've changed it to say 29 and added a note about numbering discrepancies.
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 ]
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stamped at top center of plate, "38" at top right. Passenger plates stamped with "A" at top left. none: 123–456 Missouri: Embossed black lettering and rims on white base. "19 MISSOURI 38" at bottom. none: 123–456 unknown Montana: Embossed black numbers on orange plate with state-shaped border; embossed black buffalo skull used as separator ...