Colour-blind question.??
Question: If someone is colourblind, is it their eye, their optic nerve or their brain which has the problem? (Which part of the eye/brain?)
Answers: Depends on the cause of the colour blindness. For people that are congentially colour blind it is the cone cells at the back of the eye which are defective.
Some people experience colour desaturation (ie. reds look less red) with optic nerve problems. Other types of colour defect occur after a stroke so are based in the brain.
However, the vast majority of colour blind people are congential and thus caused by problems with the cone cells at the back of the eye.
http://ghr.nlm.nih.gov/condition=colorvi...
Its really depending on the type of color blindness... the most common type of color blindness is red/green and predominantly genetic..... It can also be due to eyes/brain/nerve damage. I found some info that answers your question :)
There are many types of color blindness. The most common are red-green hereditary (genetic) photoreceptor disorders, but it is also possible to acquire color blindness through damage to the retina, optic nerve, or higher brain areas. Higher brain areas implicated in color processing include the parvocellular pathway of the lateral geniculate nucleus of the thalamus, and visual area V4 of the visual cortex. Acquired color blindness is generally unlike the more typical genetic disorders. For example, it is possible to acquire color blindness only in a portion of the visual field but maintain normal color vision elsewhere. Some forms of acquired color blindness are reversible. Transient color blindness also occurs (very rarely) in the aura of some migraine sufferers.
The different kinds of inherited color blindness result from partial or complete loss of function of one or more of the different cone systems. When one cone system is compromised, dichromacy results. The most frequent forms of human color blindness result from problems with either the middle or long wavelength sensitive cone systems, and involve difficulties in discriminating reds, yellows, and greens from one another. They are collectively referred to as red-green color blindness , though the term is an over-simplification and somewhat misleading. Other forms of color blindness are much more rare. They include problems in discriminating blues from yellows, and the rarest forms of all, complete color blindness or monochromacy, where one cannot distinguish any color from grey, as in a black-and-white movie or photograph.
Answers: Depends on the cause of the colour blindness. For people that are congentially colour blind it is the cone cells at the back of the eye which are defective.
Some people experience colour desaturation (ie. reds look less red) with optic nerve problems. Other types of colour defect occur after a stroke so are based in the brain.
However, the vast majority of colour blind people are congential and thus caused by problems with the cone cells at the back of the eye.
http://ghr.nlm.nih.gov/condition=colorvi...
Its really depending on the type of color blindness... the most common type of color blindness is red/green and predominantly genetic..... It can also be due to eyes/brain/nerve damage. I found some info that answers your question :)
There are many types of color blindness. The most common are red-green hereditary (genetic) photoreceptor disorders, but it is also possible to acquire color blindness through damage to the retina, optic nerve, or higher brain areas. Higher brain areas implicated in color processing include the parvocellular pathway of the lateral geniculate nucleus of the thalamus, and visual area V4 of the visual cortex. Acquired color blindness is generally unlike the more typical genetic disorders. For example, it is possible to acquire color blindness only in a portion of the visual field but maintain normal color vision elsewhere. Some forms of acquired color blindness are reversible. Transient color blindness also occurs (very rarely) in the aura of some migraine sufferers.
The different kinds of inherited color blindness result from partial or complete loss of function of one or more of the different cone systems. When one cone system is compromised, dichromacy results. The most frequent forms of human color blindness result from problems with either the middle or long wavelength sensitive cone systems, and involve difficulties in discriminating reds, yellows, and greens from one another. They are collectively referred to as red-green color blindness , though the term is an over-simplification and somewhat misleading. Other forms of color blindness are much more rare. They include problems in discriminating blues from yellows, and the rarest forms of all, complete color blindness or monochromacy, where one cannot distinguish any color from grey, as in a black-and-white movie or photograph.
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