color blindness

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color blindness,

visual defect resulting in the inability to distinguish colors. About 8% of men and 0.5% of women experience some difficulty in color perception. Color blindness is usually an inherited sex-linked characteristic, transmitted through, but recessive in, females. Acquired color blindness results from certain degenerative diseases of the eyes. Most of those with defective color vision are only partially color-blind to red and green, i.e., they have a limited ability to distinguish reddish and greenish shades. Those who are completely color-blind to red and green see both colors as a shade of yellow. Completely color-blind individuals can recognize only black, white, and shades of gray. Color blindness is usually not related to visual acuity; it is significant, therefore, only when persons who suffer from it seek employment in occupations where color recognition is important, such as airline pilots, railroad engineers, and others who must recognize red and green traffic signals. Tests for color blindness include identifying partially concealed figures or patterns from a mass of colored dots and matching skeins of wool or enameled chips of various colors.

Color Blindness


the inability to distinguish colors. Total color blindness (monochromatism), in which no color differences can be distinguished, is rare. (SeeDALTONISM for a discussion of partial color blindness.)

color blindness

[′kəl·ər ‚blīnd·nəs]
Inability to perceive one or more colors.
References in periodicals archive ?
All patients show reduced contrast sensitivity and dyschromatopsia, which are often out of proportion to the visual acuity deficit.
The left eye also exhibited a large central scotoma, dyschromatopsia, and a left afferent pupillary defect.
Quantitative analyses of dyschromatopsia used Bowman's (66) method to describe color-confusion space.
A less severe form of the disorder is called dyschromatopsia, the most common symptom being 'hemeralopia' and as a result, achromatopsia frequently leads to photophobia.
Patients with central serous chorioretinopathy present with diminution of vision, metamorphopsia, relative central scotoma, micropsia, dyschromatopsia and blurring of vision.