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The first is mis-calling the white light the complement of the colors presented. For example, red-white is said to be "red-green", or green-white is called "green-red". The second is when a pair of lights of the same color but differing in brightness by 50% is displayed, the brighter identical color is said to be "white".
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.
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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In some cases, additional tests such as a color vision test, optical coherence tomography (OCT), or an electroretinogram (ERG) may be used to check for retinal or optic nerve abnormalities. Neurological evaluation may be necessary if cyanopsia is accompanied by other neurological symptoms.
A list of standardized illuminants, their CIE chromaticity coordinates (x,y) of a perfectly reflecting (or transmitting) diffuser, and their correlated color temperatures (CCTs) are given below. The CIE chromaticity coordinates are given for both the 2 degree field of view (1931) and the 10 degree field of view (1964). [ 1 ]
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