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Color blindness may also present itself as a symptom of degenerative diseases of the eye, such as cataract and age-related macular degeneration, and as part of the retinal damage caused by diabetes. Vitamin A deficiency may also cause color blindness. [47] Color blindness may be a side effect of prescription drug use.
Monochromacy (from Greek mono, meaning "one" and chromo, meaning "color") is the ability of organisms to perceive only light intensity without respect to spectral composition. Organisms with monochromacy lack color vision and can only see in shades of grey ranging from black to white. Organisms with monochromacy are called monochromats.
Protanopia is a severe form of red-green color blindness, in which the L-cone is absent. It is sex-linked and affects about 1% of males. Colors of confusion include blue/purple and green/yellow. [2] Deuteranopia is a severe form of red-green color blindness, in which the M-cone is absent. It is sex-linked and affects about 1% of males.
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Males are more likely to inherit red–green color blindness than females, because the genes for the relevant opsins are on the X chromosome. [1] Screening for congenital red–green color blindness is typically performed with the Ishihara or similar color vision test. [1] It is a lifelong condition, and has no known cure or treatment. [1]
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The numerical range is generally not specified, except that the lower end is generally bounded by zero. It is common to use the LMS color space when performing chromatic adaptation (estimating the appearance of a sample under a different illuminant). It is also useful in the study of color blindness, when one or more cone types are defective.
Congenital red-green color blindness, the genetic condition that causes the most cases of color blindness. Dichromacy, a type of color vision possessed by most mammals; partial color blindness when in humans. Monochromacy, a lack of color vision; total color blindness when in humans. Achromatopsia, a syndrome that includes total color blindness.