colorblindness presentation

colorblindness presentation - By: Brett Kratchman...

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By: Brett Kratchman
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Colorblindness is a defect of vision affecting the ability to distinguish colors, occurring mostly in males. Color blindness is caused by a defect in the retina or in other nerve portions of the eye. Also known as dichromatism, this disease consists of the inability to differentiate between reds and greens.
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The signs and symptoms of colorblindness depend on certain factors: Is the problem congenital, acquired, partial, or complete? Does the patient have trouble distinguishing reds and greens? Is the patient experiencing reduced vision?
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Color vision deficiency is usually detected using colored charts called the Ishihara Test Plates. The plates consist of gray and colored dots. The patient is asked to identify the number in the middle of the circle. After the patient has identified what they see, more testing may commence. Vision test examples. Normal people should see 74.  Color deficient people may see  D=21.
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A random pattern of gray level dots is first put together.                                                                      A digit pattern is then added which is defined by yellow/blue variation only. Since most people with red/green colorblindness can see yellow/blue they will be able to see the digit 5 in this test pattern. Another digit pattern which is defined by red/green variation is added. Here is the pattern composed of the random brightness pattern and the red/green pattern. Finally all three are added: People with red/green
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This note was uploaded on 12/24/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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colorblindness presentation - By: Brett Kratchman...

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