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Transcript of Color Blindness
Total or partial
Based on clinical appearance, color blindness may be described as total or partial. Total color blindness is much less common than partial color blindness. There are two major types of color blindness: those who have difficulty distinguishing between red and green, and who have difficulty distinguishing between blue and yellow.
Total color blindness is the inability to see any color.
There are two types of partial color blindness. These include either red-green color blindness or blue-yellow blindness.
Red weakness (Protanomaly)
Green weekness (Deuteranomaly)
This form of color deficiency is when the person can not discriminate small differences in the hues in the red, orange, yellow, green region of the spectrum. This person does not have the loss of brightness problem seen in red weakness individuals. This individual makes errors in the naming of colors in this region because the appear somewhat shifted towards red on the color spectrum.
What is color blindness?
Color blindness is the inability or decreased ability to see color, or perceive color differences, under normal lighting conditions. Color blindness affects a significant percentage of the population. An individual that is color blind has their life changed because of this. It can make it harder to learn and read. Also due to being color blind you are limited to the career you chose. For example, you can not be a fire fighter, police officer or airline pilot.
Color blindness is encoded on the X chromosome.
Color Blindness test
The number "74" should be seen by individuals who do not have color blindness.
The number "21" should be seen by individuals who have red-green color blindness.
Individuals that have total color blindness will not see any number at all but only shades of white, black and grey.
The Ishihara color test, is the most common test used by doctors to find out if their patient is color blind or not. This test consists of a series of pictures of colored spots.The test is most often used to diagnose red–green color deficiencies. A figure (usually one or more numbers) is embedded in the picture as a number of spots in a slightly different color, and can be seen with normal color vision, but not with a particular color defect.
Statistics & Facts
5% to 8% of men and 0.5% of women in the world are born colorblind
OR 1 out of 12 men and 1 out of 200 women
Dogs are not color blind
A father can not pass his red-green color blindness to his sons
If a women is red-green color blind all of her sons will also be color blind
In some countries you need normal color vision to get a drivers license
Color Blindness test con't.
This form of color deficiency is when redness is seen less bright. Red, orange, yellow, and yellow- green appear somewhat shifted in hue towards green. The red component that a normal person sees in a violet or lavender color is so weak for the color blind individual that he may fail to detect the red and therefore only sees the blue. Therefore, to the red weakness individual the color that normals call violet may only look like another shade of blue.
Causes of color blindness
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. If just one pigment is missing, you may have trouble telling the difference between red and green. Most color blindness is due to a genetic problem and is present at birth. The drug hydroxychloroquine can also cause color blindness, which is used to treat arthritis.
Treatment of color blindness
There is no true treatment for color blindness. However, there are special contact lenses and glasses that may help people with color blindness tell the difference between similar colors.
By: Claudia Stone
Color Blindness Simulator
normal color vision
total color blindness
Color blind individuals can see a "2" while non-color blind individuals will either see nothing, a wrong number or design. For example, a non-color blind individual may see a "5" or eventually see a "2" if they look long and hard enough.
Some tests are made that color blind individuals are able to see the number easily but non-color blind individuals recognize a wrong number or no number at all.
Non- color blind individuals will not easily see a number but if they look for a while they will be able to find it. On the other hand colorblind individuals will easily see a number 5.