+ Rates of<unk>  Males Females Dichromacy 2.4% 0.03% Protanopia (red deficient: L cone absent) 1.3% 0.02% Deuteranopia (green deficient: M cone absent) 1.2% 0.01% Tritanopia (blue deficient: S cone absent) 0.001% 0.03% Anomalous trichromacy 6.3% 0.37% Protanomaly (red deficient: L cone defect) 1.3% 0.02% Deuteranomaly (green deficient: M cone defect) 5.0% 0.35% Tritanomaly (blue deficient: S cone defect) 0.0001% 0.0001%<unk>  affects a large number of individuals, with protans and deutans being the most common types. In individuals with Northern European ancestry, as many as 8 percent of men and 0.4 percent of women experience congenital<unk>  deficiency. The number affected varies among groups. Isolated communities with a restricted gene pool sometimes produce high proportions of<unk> , including the less usual types. Examples include rural Finland, Hungary, and some of the Scottish islands. In the United States, about 7 percent of the male population—or about 10.5 million men—and 0.4 percent of the female population either cannot distinguish red from green, or see red and green differently from how others do (Howard Hughes Medical Institute, 2006). More than 95 percent of all variations in human<unk>  vision involve the red and green receptors in male eyes. It is very rare for males or females to be "blind" to the blue end of the spectrum. +Prevalence of red–green<unk>  among males Population Numberstudied % Arabs (Druzes) 337 10.0 Aboriginal Australians 4,455 1.9 Belgians 9,540 7.4 Bosnians 4,836 6.2 Britons 16,180 6.6 Chinese 1,164 6.9 DR Congolese 929 1.7 Dutch 3,168 8.0 Fijians 608 0.8 French 1,243 8.6 Germans 7,861 7.7 Hutu 1,000 2.9 Indians (Andhra Pradesh) 292 7.5 Inuit 297 2.5 Iranians 16,180 6.6 Japanese 259,000 4.0 Mexicans 571 2.3 Navajo 571 2.3 Norwegians 9,047 9.0 Russians 1,343 9.2 Scots 463 7.8 Swiss 2,000 8.0 Tibetans 241 5.0 Tswana 407 2.0 Tutsi 1,000 2.5 Serbs 4,750 7.4
Color blindness
Flash blindness
Tunnel vision
Myopia
Cortical blindness
Amblyopia
Red eye 
Retinopathy