color blindness

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Related to Color-blindness: Ishihara test

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 ?
Neville refers to the modem-day notion of color-blindness as the idea that "race should not and does not matter" (Neville, 2000, p.
Ferguson answers many of Loury's charges: color-blindness is just the beginning of an argument about citizenship--its rights and responsibilities--and republican government.
Many readers will be led, in particular, to take issue with Chang's analysis of the costs and benefits associated with rejecting the aspiration to color-blindness that lies at the heart of traditional civil rights discourse.
The color-blindness mutation of people on Pingelap is found on chromosome 8.
The first centers on the fact that when Congress moved to address the problem of employment discrimination against blacks, instead of using race for blacks instead of against them, the response was a call for color-blindness.
Affirmative action supporters counter that color-blindness is a goal, not a means.