In many cases it is almost unnoticeable, but in a minority the tetrachromacy is very pronounced. Other causes of color blindness include brain or retinal damage caused by accidents and other traumas which produce swelling of the brain in the occipital lobeand damage to the retina caused by exposure to ultraviolet light wavelengths 10 to nm. It is known to be an autosomal recessive disease and can be provoked by different circumstances. A Brazilian court ruled that people with color blindness are protected by the Inter-American Convention on the Elimination of All Forms of Discrimination against Person with Disabilities. Sign In. Because one female is not affected, she must have inherited an unaffected autosomal allele from the heterozygous father. For colour blindness recessive to be passed on both transmitted x chromosomes would have to carry the deficiency.
More sophisticated apps allow users to find out both color and shades of color.
Shevell SK Journal of Vision. Eggs fertilized by sperm with an X chromosome develop into females. Rods and cones are different in how they respond to light. My ex-wife is color blind and I have normal color vision. The cause of color blindness Color perception in the human eye is build up by three different types of cones. Occupational Safety and Health Administration".