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Color blindness and color weakness

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Donahue Stein
Color blindness and color weakness, also known as"color vision to identify obstacles", refers to the inability to correctly identify part or all of the color defect.< br/>
eyes inside there are 3 different kinds of cone cells, each of the red, green, blue 3 kinds of wavelengths of light sensitive, also known as the light of the"three primary colors", when the different wavelengths of light into the eye and projected on the retina, the brain by analyzing the retinal cells of the input information to perceive different colors. If one of the functions of cells partially or completely failure, will form a"color weak." If one of the two cell function fails completely, it will form a"color-blind".
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color weak the main cause is genetic, but acquired diseases of the eye including the retina, choroid and optic nerve diseases can also cause color weak. Color weak category there are many, there are red-green weak, blue, yellow, weak or color blind, etc. Doctor or optometrist may be through different inspection tool or pattern for different age of the patient to make a diagnosis. The most commonly used tools such as"Ishihara's chart"Ishihara) color blindness color weakness. If you want to determine the color of a weak degree, will have to use other, less accurate color of the grain arrangement of the test. If the patient is completely without the ability to distinguish colors, different colors are considered to be the same color, only shades of the points, it is called"color blindness"。< br/>
suffering from red-green color blind people find it difficult to identify the red, green tones. Red-green blind red blind, green blind, red-weak and Green is weak. Red-green blindness among patients, more men than women, this is because red-green blindness is X chromosome recessive genetic disease, that control the red-green color vision genes located on the X chromosomes.
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Donahue Stein
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