Color blindness is a genetic condition that occurs more frequently in men than in women. Acquired condition may be due to injury, illness, aging. The aging process causes the cornea to turn yellow, making it difficult for people to see the blue and violet colors. This condition occurs when aging is not called color blindness.
The common belief that people who are colorblind only see in black and white is incorrect. There are many types and degrees of blindness. For some people, the condition can be very mild, manifested only through the difficulties in seeing small differences in color. Some people with mild degree of color blindness may not know they are suffering from this disease, and in tests carried out as normal individuals.
Moreover, this condition can also be serious. For people with severe deficiencies of color it is impossible to discriminate some different colors. For example, a pacient with color deficiency notice no difference between red, orange and green; you see these colors as one and do not understand why other people naming the same color in three different ways.
Color blindness can be:
- By type by far the most common color deficiency - anomalous trichromacy
- Dichromacy - less frequent.
Trichromacy anomalous reduces the ability to discriminate between colors, but does not eliminate the perception of color completely. There are two types: protanomaly ("red weakness") and deuteranomaly ("green-weak").
Dichromats be protanope or deuteranope. In protanopia brightness of red, orange and yellow is very small, these people can not discriminate red and green or violet purple and various shades of blue. Deuteranopia causes the patient to see red, orange, yellow and green as the same color and violet, lavender, purple and blue all look the same to the deuteranope.
Another form of color blindness is achromatopsia, characterized by the complete loss of color vision. It is a very rare type of color deficiency.
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