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Visual Defects
ʱ䣺2013-01-03 21:14:25

 Those with normal color vision cells in the retina, there are three vertebrae, which can quickly and correctly detect,

distinguish red, green, and blue, and can use red, green, and blue mixed color. However, some people because of the

visual defects such as congenital or acquired vertebral hypoplasia of the optic nerve cells are damaged, resulting in not

distinguish certain colors, these people who are abnormal color vision. With unusual severity can be divided into mild

and severe abnormal color vision were abnormal visual person, also corresponds to the color weakness and blindness.

1, color weakness

    Color weakness, also known as mildly abnormal color vision were. Patients can color weakness are red, green, and

blue, but its poor ability to distinguish, such as the red, green, and must be within the spectrum of a longer interval in

order to distinguish; color deficiency patients according to the red, green, and blue color mixing, only red, green, and

blue relative proportion different from the normal color vision.

    Color weakness divided into three categories, namely, weak red, green, weak, weak blue. Among them, the red to

red to distinguish weak poor ability; Green weak poor ability to distinguish green; blue is weak against a blue, yellow, poor

ability to distinguish.

    Color weakness with normal color vision were no clear strict boundaries, and occurred the day after tomorrow, such as

vision-related diseases cause.

2, color blindness

    Abnormal color vision, color blindness is a serious person, color blindness can be divided into full-color blindness and

partial blindness, in which the retina is not fully Semanghuanzhe vertebral cells, only rod cells, it can only feel the black

and white grayscale variation; partial blindness, also known as two color vision who partial color blindness can be divided

into red - green color blindness, blue - yellow blind. Red - green color blindness can not distinguish between red and green,

is divided into red and green blind-blind, color blindness are called alpha, beta achromatopsia, blue - yellow color blindness

blind called hepatitis C, can not distinguish between blue and yellow, only red, green produce color vision. Normal color vision

and color blindness see the three red, green, blue and white situation as shown below.

   Normal                       Protanopia                       Deuteranopia                      Blue - Yellow Blind
figure. Those with normal color vision see the color contrast partial blindness

    Dalton is a "bizarre facts about color vision," the first scientific monograph discusses colorblind. Dalton itself is an influenza a

colorblind person, so often the red - green color blindness called achromatopsia Dalton.