- Deutan
- 6% of males
- Defect in M-opsins for medium wavelength sensitive cones
- Deuteranomaly
- most common
- a type of anomalous trichomacy
- abnormal function of green cones
- Deuteranopia
- A type of dichromacy
- non-functioning green cones
- Protan
- 2% of males
- Defect in L-opsins for long wavelength sensitive cones
- Reduces the sensitivity of red light
- Protanomaly
- a type of anomalous trichomacy
- abnormal functioning red cones
- Protanopia
- A type of dichromacy
- non-functioning red cones
- defect in S-opsins for short wavelength sensitive cones
- Tritanomaly
- a type of anomalous trichomacy
- abnormal function of blue cones
- difficulty discerning between blue and green and between yellow and red
- Tritanopia
- A type of dichromacy
- non-functioning blue cones
- unable to discern between blue and green, purple and red, yellow and pink
- non-functioning red and green cones
- only blue cones function
- central vision is significantly affected
- Achromatopsia (monochromacy)
- no functioning cones
- Central vision usually affected
- accompanied by nystagmus in congenital disease
oculoman