Definition for Difference between revisions of "Color blindness"

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(Created page with "Color blindness is the inability to see certain colors in the usual way. ==== Causes, incidence, and risk factors ==== Color blindness occurs when there is a problem with the c...")
 
(Replaced content with "Defective color vision caused by reduction or absence of visual pigments. There are three forms: red, green, and blue blindness.")
 
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Color blindness is the inability to see certain colors in the usual way.
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Defective color vision caused by reduction or absence of visual pigments. There are three forms: red, green, and blue blindness.
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==== Causes, incidence, and risk factors ====
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Color blindness occurs when there is a problem with the color-sensing granules (pigments) in certain nerve cells of the eye. These cells are called cones. They are found in the retina, the light-sensitive layer of tissue that lines the back of the eye.
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If just one pigment is missing, you may have trouble telling the difference between red and green. This is the most common type of color blindness. If a different pigment is missing, you may have trouble seeing blue-yellow colors. People with blue-yellow color blindness usually have problems identifying reds and greens, too.
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The most severe form of color blindness is achromatopsia. A person with this rare condition cannot see any color, so they see everything in shades of gray. Achromatopsia is often associated with lazy eye, nystagmus (small, jerky eye movements), severe light sensitivity, and extremely poor vision.
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Most color blindness is due to a genetic problem. (See: X-linked recessive) About 1 in 10 men have some form of color blindness. Very few women are color blind.
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The drug [[hydroxychloroquine]] (Plaquenil) can also cause color blindness. It is used to treat rheumatoid arthritis, among other conditions.<br>
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Latest revision as of 21:11, 29 May 2021

Defective color vision caused by reduction or absence of visual pigments. There are three forms: red, green, and blue blindness.

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