pseudoisochromatic plate

pseudoisochromatic plate: any of a series of charts containing dots of various sizes, brightnesses, and colors, with the dots arranged to form numbers, letters, or other figures that are visible to those with normal color vision but which cannot be discerned by those with color perception defects. See also Ishihara test, under test.

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pseudoisochromatic plate — |sü(ˌ)dō+... noun Etymology: pseudoisochromatic from pseud + isochromatic : one of a set of colored plates that include some which appear isochromatic to individuals with color vision abnormality and that are widely used as a test for color… … Useful english dictionary
Ishihara test — n a widely used test for color blindness that consists of a set of plates covered with colored dots which the test subject views in order to find a number composed of dots of one color which a person with various defects of color vision will… … Medical dictionary
test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… … Medical dictionary

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