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color blindness

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by

Liying Huang

on 10 December 2013

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Transcript of color blindness

Color blindness is the inability or decreased ability to see color, or perceive color differences, under normal lightening conditions.
Genetic disorder:
Color Blindness
There is no actual blindness but there is deficiency of color.
The most usual cause is the fault in the development of one or more sets of retinal cones that perceive color in light and transmit that information to the optic nerve.
This type of color blindness is usually a sex-linked condition. The genes that produce photopigments are carried on the X chromosome. Therefore, if some of these genes are damaged or missing, color blindness will be expressed in males with higher probability than in females because males only have 1 X chromosome.
In females, a functional gene on only one of the two chromosomes is sufficient to yield the needed photopigments.In another word, color blindness is recessive.
Color blindness may be described as total or partial. Total color blindness is much less common. The two major types of partial color blindness: those who have difficulty distinguishing between red and green, and who have difficulty distinguishing between blue and yellow.
A normal person see
red & green colorblind
blue & yellow colorblind
There is generally no treatment to cure color deficiencies. Optometrists can supply colored spectacle lenses to wear but it can make other colors more difficult to distinguish.
Color blindness affects approximately 1 in 12 men (8%) and 1 in 200 women in the world.
There are many inventions to help colorblind people, such as the special traffic lights and color sign code.
Abortion? Definitely NO!
The color blind population is quite big which means the child is not alone. In most cases colorblind doesn't really affect their life at all. There are even completely colorblind professors -so be assured that colorblind is not a handicap on the personal development of the child.
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