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 ?
To bring to life the impact of seeing certain colors for the first time, Clorox 2 and EnChroma today unveiled a video that captures a family in Indiana with eight brothers -- all of whom are color blind -- trying on EnChroma glasses.
We're proud to help color blind people overcome some of the obstacles color deficiency presents, and to help them enjoy the full spectrum of life.
We are excited to work with EnChroma so that our color blind visitors can learn from and enjoy all of the Newseum's exhibits.
June 11, 2015 /PRNewswire/ -- EnChroma -- the company bringing color to the color blind -- today announced that its glasses that help the color blind see colors will be available for use during the opening weekend of the California Academy of Sciences Color of Life exhibit June 13-14, 2015.
Turner, today said the allegations were baseless, and "our service is color blind.
Color Blind People Can See Colors Indoors to Overcome Classroom, Occupational, Safety and Other Limitations -
That machine is totally color blind and provides no bias on who the voter votes for .
Judge Friedman, in ruling against the University of Michigan law school, recognized that there is no compelling state interest that would supersede this bedrock constitutional requirement that government must be color blind.
Already, Linotype-Hell, Logo, Color Blind and Canto have announced their support for the Helios ColorSync 2 XTension.
SAN FRANCISCO, April 3, 2014 /PRNewswire/ -- The first major study of color blindness in a multi-ethnic group of preschoolers has uncovered that Caucasian male children have the highest prevalence among four major ethnicities, with 1 in 20 testing color blind.
If recreational golfers as a group were not color blind, maybe the game just might be more fun than frustrating.
For the first time, color blind students returning to school can add a software program that's specifically for them to their Back to School supplies.