Colorblindness


Colorblindness
The inability to perceive colors in a normal fashion. The most common forms of colorblindness are inherited as sex-linked (X-linked) recessive traits. Females are carriers and males are affected. As a result, approximately 1 in 8 males is colorblind as compared to less than 1 in 100 females. The most common form of colorblindness is red-green. There is a wide range of variability within this group from very mild to extreme. The second most common form is blue-yellow. A red-green deficit is almost always associated with this form. The most severe form of colorblindness is achromatopsia, the inability to see any color. It is often associated with other eye problems such as amblyopia (lazy eye), nystagmus, photosensitivity, and extremely poor vision. The symptoms of red-green and blue-yellow colorblindness may be so mild that affected people are unaware they are colorblind unless specifically tested. Parents may notice colorblindness in a more severely affected child at the time the child would normally learn colors. Several color vision tests are available through a primary physician or an eye specialist (ophthalmologist). Testing for colorblindness is commonly performed along with other vision screenings. There is no known treatment. People with this condition need to learn to cope. Colorblindness is a life-long condition. Colorblindness may exclude people from some jobs, such as being a pilot, where color vision is essential. People with red-green colorblindness may also fail to notice the presence of blood in the urine and stool.

Medical dictionary. 2011.

Look at other dictionaries:

  • colorblindness — See colorblind. * * * …   Universalium

  • colorblindness — noun The state of being colorblind …   Wiktionary

  • colorblindness — n. inability to see colors …   English contemporary dictionary

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  • Deuteranomaly — Colorblindness of the red green type, also known as deuteranopia or Daltonism. The term Daltonism is derived from the name of the chemist and physicist, John Dalton (1766 1844). Dalton was born in a village in Cumberland, England where his father …   Medical dictionary

  • Deuteranopia — Colorblindness of the red green type, also known as deuteranomaly or Daltonism. The term Daltonism is derived from the name of the chemist and physicist, John Dalton (1766 1844). Dalton was born in a village in Cumberland, England where his… …   Medical dictionary

  • Color blindness — Colorblind and Colourblind redirect here. For other uses, see Colorblind (disambiguation). Color blindness or color deficiency Classification and external resources An 1895 illustration of normal vision and various kinds of color blindness …   Wikipedia


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