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They are known as Ishihara charts. They are named after their inventor, Japanese ophthalmologist Shinobu Ishihara (1897–1963). Each image consists of closely packed coloured dots and a number. The patient must identify the number or image he or she can see. The type of colour blindness a patient has is identified using the range of charts.
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.
Basiert auf Datei:Ishihara 2.svg und Datei:Wikipedia-logo-v2-de.svg. Achtung: Ich musste mich mit dem Java-Programm "Color Oracle" behelfen, weil ich keine Quelle dazu gefunden habe, welche Helligkeiten von Grün und Rot von Betroffenen als identisch wahrgenommen werden.
Color blind glasses; Color blindness; Congenital red–green color blindness; Ishihara test; List of instruments used in ophthalmology; User:Daniel Mietchen/Wikidata lists/Items with Disease Ontology IDs
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]
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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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