"Color Blindness"

Color cecity is the inability to distinguish particular colors. It is generally an inherited

trait, exclusively nates result from a chemical imbalance or eye injury.

        There argon three essential colors. They are red, blue, and yellow. All other colors are the

results of different combinations of primary colors. Special visual cells, called cones, are respon-

sible for our ability to see color. mint with approach pattern vision know three different types of cones,

each amenable for a different primary color.

        The absence of particular cones causes the absence of particular colors. This can be one

cause of color craftness. There are four types of color blindness. The rarest forms are mono-

chromatism and a-typical monochromatism. people with monochromatic vision, or total color

blindness, has no cones at all. As a result, they have no ability to see colors, and no hue disparity whatsoever. Monochromatic vision is very similar to watching a black and white television

program.

        Somebody with a-typical monochromatic vision has exactly one type of cone, and can see just

one color, and various dark glasses of that color. This form is even rarer than the typical monochro-

matism.

        A nonher, more common, form of color blindness is called dichromatism. People with di-

chromatic vision tend to confuse red, green, and gray, but can easily distinguish blue and yellow.

Some cannot even see the hourlong wavelengths of light -- the red end. Though it is rare, others

cannot see the short wavelengths, heartfelt the violet end. These people tend to confuse blue, yellow,

and gray, but not red and green.

        Normal vision is called trichromatism. Most color blind people have a version of trichro-

matism called anomalous trichromatism. People with this condition can see the same colors as

people with normal vision, but not as well. For example, many people with this...

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