What is a color blind test?

Many people believe that the failure of the color blindness test means that one sees things like a black and white film. Being a blind color usually does not mean that one does not see any color at all. It simply means that it has difficulty in color resolution. For example, a person who is blind may have difficulty distinguishing between green leaves, red apples and brown branches of the tree. From a technical point of view, a more accurate name for color blindness would be a lack of color vision. This simple test, developed by Japanese ophthalmologist Shinobu Ishihara, asks the object to identify numbers that are printed as a number of colored dots on a dotted background of a different color. For example, number 5 can be shown in green dots on red, orange and yellow dotted background. If the subject can clearly see both red and green, there will be no difficulty identifying Number in this part of the color blind test.

mostThe problems of seeing colors are genetic and present when the child is born. Color blindness is much more common in men than women and more common among the Caucasians than members of other ethnic groups, with 8 to 10 percent of Caucasian men having some form of color blindness. Among the Caucasian women, only 0.5 percent of the color blind test fails. The overall lack of color vision in which one can only see shades of gray is very rare.

It is important to perform a color blindness test over the years of early childhood, because I cannot identify colors can cause a child to have difficulty working at school. Even something as simple as writing a teacher with a yellow chalk on a green board can be a school work frustrating for a colorful blind child who does not realize that he sees things differently than his peers.

Color blindness to heal or repair, but people who are blind, generally learn that they are quite easy to realize for the problem. For example, most people who are blind have troubleE with distinction between red and green. When they learn how to drive, they simply remember the position of the color on the traffic light to solve this problem.

While colored blindness is a form of vision lack, does not affect a person's ability to pass a standard eye test. A person who is blind is not more or less likely to need corrective lenses than someone who is not blind. There are studies that suggest that people who are blind have a little better night vision than people who are not blind colors.