Color-blind

According to the three primary colors theory, can be any color from red, green, and blue color. A child can identify three primary colors, and known as the "tri-color, as" completely normal color vision ability, for normal people. Reduced ability to identify any kind of color who called suffering from color amblyopia. Patients red colors are mainly two kinds of weak-weak and green. If a color can tell, and in medicine known as the "two-color vision", that is, they say, the color-blind, clinical mainly red and green blindness blindness. Such as the three kinds of primary colors can not identify, called the full-color blindness. Color-blind persons, see the world has always kept a layer of gray veil, not only do not enjoy colorful world the joy and happiness, but also in the recruitment, education, employment and livelihood, but also be seriously affected.

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