color blindness

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Related to color vision deficiency: Color blind

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 ?
The purpose of our study was to find out frequency of color vision deficiency in this area of Pakistan.
Conclusion: Color vision deficiency was observed in 0.9% of candidates screened for pre-employment health check up in a tertiary care hospital.
Evans goes on to point out that Color Vision Deficiency need not be thought of as 'the end of the world.' There are lots of job opportunities to be had for those who cannot see color as is seen by the majority of the population; living in a color coded world is doable even for those who do not really see the color.
IMPORTANT NOTE: Teachers should be aware that about 8% of the general population has some "color vision deficiency" (color blindness).
Both monitors can simulate two types of red-green color vision deficiency -protanopia and deuteranopia.
Generally, errors increased as the severity of the color vision deficiency became more marked.
While I know that both my husband and son have some color vision deficiency, I had never thought about how it affected their use of the Web.