This reference lists the types of color blindness (color vision deficiency). Red-green types are by far the most common; total color blindness is extremely rare.
| Type | Affects | Notes |
|---|---|---|
| Deuteranomaly | Green-weak | Most common (~5% of men) |
| Protanomaly | Red-weak | Common |
| Protanopia | Red-blind | No working red cones |
| Deuteranopia | Green-blind | No working green cones |
| Tritanomaly | Blue-weak | Rare |
| Tritanopia | Blue-blind | Very rare |
| Achromatopsia | Total color blindness | Extremely rare — sees only shades of grey |