it is a genetic defect that cause difficulty at distinguishing colors, the word comes from the physical blindness John Dalton Who suffered this disorder.
the grade of involvement varies greatly, the affection is the lack of the ability to distinguish any colors and a slight degree to distinguish some shades of red and green.
when the person perceives a color which may vary depending on the intensity and type of light.
The affected has three types of cones with functional defects which confuses one color with another.
in the night the color is different than when is viewed in the light of the sun.
The genetic defect is heritary, if a male inherits an x chromosome with deficiency will blindness, if both chromosomes have deficiency therefore color blindness affects men more than women.
there are three types of color blindness;
the achromatic, monochromatic and dichromatic:
Achromatic is when the person does not have any of the three colors is presented only one case per 100,000 people.
monochromatic: is when the person have one of the three pigments and the vision of light and color is reduced to a dimension.
Dichromatic:is a moderately severe defect in which one diffusion suffer lack one of the three basic color mechanisms.
The most common group of colorblind has three types of cones but perceive altered colors.
Diagnostic:the method most commonly used for diagnosis are card Ishihara.
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