I went to see the specialist today and he explained that colour blindness is mostly heritary however, my parents don't suffer from it.
That aside, most kinds of congenital colorblindness are caused by defects in the X chromosome. Since females have two X chromosomes and males have an X chromosome and a Y chromosome, colorblindness is much more common in males: females must have defects in both chromosomes before they exhibit colorblindness.
Approximately 5% to 8% of the men and 0.5% of the women of the world are born colorblind. That's as high as one out of twelve men and one out of two hundred women. People who are protans (red weak) and deutans (green weak) comprise 99% of this group.
In most colorblindness, the person has a different mixture of cones from normal. The cone cells on the retina are the crucial physical components in seeing color. People with normal color perception have three different cones, each cone is tuned to perceive mostly either Long wavelengths (reddish), Middle wavelengths (greenish), or Short wavelengths (bluish), referred to as L-, M-, and S- cones. Our minds determine what "color" we are seeing by determining the ratio between signals from different types of cones. In people with colorblindness, either a type of cone is missing, or the cone has a different peak absorption from normal.
So i am a rare case. =( its sad nto to be able to appreciate colours like others. but oh well.
