| Oliver Sacks, in the Case of the
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| | subtle which is why early reporting is
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| Colorblind Painter, describes how an
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| | essential.If you acquire color
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| artist, who was famous for his
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| | deficiencies you are more likely to
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| brilliantly-colored abstract canvasses,
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| | encounter difficulties in correctly
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| suddenly and irreversibly loses all color
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| | naming colors. This is because life-long
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| perception as the result of a car
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| | experience with defective color
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| accident. This tragic case depicted by
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| | perception enables those with the
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| Sacks is one example of an acquired color
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| | inherited form to use compensatory
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| vision deficiency.What were once vibrant
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| | techniques to overcome their
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| works of art now appeared to him grayish
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| | handicap.Because acquired color vision
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| or black and white. It was a devastating
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| | deficiencies are the result of life
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| blow for a lifelong painter whose art and
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| | events, they can arise from a variety of
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| life were now without meaning.
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| | different causes affecting the retina,
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| Not all cases of this affliction,
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| | visual pathways or areas of the brain
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| however, are as sudden, complete or
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| | which process color information.A wide
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| permanent: onset can be slow and
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| | range of prescription drugs, conditions
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| appreciation of colors can change
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| | such as multiple sclerosis, diabetes and
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| gradually over time depending on the
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| | cardiovascular diseases, some liver
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| particular eye disease.However, whereas
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| | diseases and many eye diseases can affect
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| inherited alterations to color vision
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| | the cone nerve cells which enable us to
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| tend to remain stable through life, late
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| | discriminate fine detail and colors by
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| onset color vision changes can be an
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| | day.As a result, and often in only one
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| early sign of disease or a side effect of
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| | eye at a time, color vision is
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| prescribed medication. It is important,
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| | temporarily or permanently changed. Both
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| therefore, that you consult your doctor
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| | men and women are affected
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| should you become aware of any changes in
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| | equally.Sufferers from arthritis, heart
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| your perception of color.To clarify
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| | disease and depression sometimes find
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| matters, let's look at the differences
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| | their color vision impaired as a side
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| between acquired color vision deficiency
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| | effect of their long-term use of
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| and inherited or congenital
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| | prescription drugs. Even stroke patients
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| deficiencies:Typically congenital
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| | who take aspirin over many years to thin
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| deficiencies involve confusion over red
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| | the blood can encounter altered color
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| and green. Acquired deficiencies more
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| | perception.Cataracts, glaucoma and the
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| often than not are a blue-yellow
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| | majority of eye problems affecting the
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| problem.There is a gender imbalance in
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| | retina or nerve pathways to the brain are
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| congenital defects as they are linked to
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| | associated with a reduced ability to
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| the X female chromosome. This means
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| | differentiate colors, including blues and
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| mothers (whose vision will be apparently
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| | greens.But the most widespread form of
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| normal) carry the defect to their sons.
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| | acquired color vision deficiency in the
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| Inherited color vision deficiency is,
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| | developed world, affecting some 23 per
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| therefore, more prevalent in males than
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| | cent of people over the age of 65, is
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| females.By contrast, acquired defects are
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| | age-related macular degeneration (AMD).
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| not gender-related except by gender
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| | Involving a loss of the cone-rich area of
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| differences in the experience of brain
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| | central vision (the macula) where color
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| trauma injuries, for example.As touched
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| | vision is sharpest it often leads to
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| on above acquired defects are less likely
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| | blindness.Finally, the condition known as
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| to be stable over time. With congenital
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| | optic neuritis, which can result in a
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| defects both eyes tend to be affected
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| | distortion or lack of color vision,
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| equally whereas acquired color
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| | illustrates well how one example of
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| deficiencies are more likely to affect
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| | acquired color vision deficiency can be
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| one eye more than the other. Stroke
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| | an indicator of two very different
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| victims typically experience a more
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| | prognoses.This inflammation of the optic
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| pronounced color deficiency in one
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| | nerve is sometimes diagnosed in young
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| eye.Acquired defects are not as easily
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| | children following an illness such as
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| diagnosed or detected with standard color
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| | measles or mumps.
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| vision tests. The changes can be very
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