color blindness

not to long ago i enlisted in the army and during my physical examination i had to take a color blindness test.  i found out i am color blind.  i had no idea.  it got me pretty interested in color blindness and its causes.  heres what i  found out.

  • 1 in 12 people have some sort of color deficiency. About 8% of men and 0.4% of women in the US.
  • 0.38% of women are deuteranomalous (around 95% of all color deficient women).
  • 0.005% of the population are totally colour blind.
  • 0.003% of the population have tritanopia.
  • Protanomaly occurs in about 1% of males.
  • Deuteranomaly occurs in about 5% of males. It’s the most common color deficiency.
  • Protanopia occurs in about 1% of males.
  • Deuteranopia occurs in about 1% of males.
  • Color blindness results from an absence or malfunction of certain color-sensitive cells in the retina. The retina is the nerve layer at the back of the eye that converts light into nerve signals that are sent to the brain. A person with color blindness has trouble seeing red, green, blue, or mixtures of these colors.

    Normally, the eye has three types of cone cells, which are light-sensitive cells that are located in the retina. Each type is sensitive to either red, green, or blue light. You see color when your cone cells sense different amounts of these three basic colors. When one or more of these types of cone cells is absent or fails to function properly, you may not see one of these three colors or you may see a variation of that color or a different color.

    The symptoms of color vision problems vary with the severity of the condition. In some people the problem is very minor, and they may not even be aware that they see color differently from people with normal color vision (like me). In other people the color vision problem is severe, and they can distinguish only a few shades (a person with normal color vision can see many thousands of colors). In rare cases, a person cannot see color at all but sees only black, white, and gray( my grandpa).

    there are a variety of test to determine normal color vision. The most common test is the pseudoisochromatic plate test. In this test, you are asked to look at an arrangement of colored dots and identify a pattern, such as a letter or number. The type of color vision problem you have can often be determined by which patterns you can and can’t see in the various plates used for the test.

    if you have normal color vision you should see the number 74

    if you have normal color vision you should see the number 74

    if you have normal color vision you should see the number 6

    if you have normal color vision you should see the number 6

    Those with normal color vision should read the number 29. Those with red-green deficiencies read the number 70. Those with total color-blindness can not read any number.

    Those with normal color vision should read the number 29. Those with red-green deficiencies read the number 70. Those with total color-blindness can not read any number.

    Those with normal color vision should not be able to read any number. Most of those with red-green deficiencies should read the number 5. Those with total color blindness can not read any number.

    Those with normal color vision should not be able to read any number. Most of those with red-green deficiencies should read the number 5. Those with total color blindness can not read any number.

    i do not see any numbers.

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