Our perception of colour comes from the response of three different sets of cones.
- short-wavelength, medium-wavelength, long-wavelength
Each type of cone has a different type of opsin
Colour Blindness
Red-Green Colour Blindness
- Occurs most in males because its transferred on the X chromosome
- Protanopia red cones contain green opsin
- Deuteranopis green cones contain red opsin
Blue-Yellow Colour Blindness
- aka Tritanopia
- very rare, occurs equally as likely in males and females as its not on the X chromosome
- Retina lacks blue cones, objects are perceived as reds and greens
Opponent Process Theory
Receptive fields of bipolar cells and ganlion cells respond in a CENTER-SURROUND way. This is known as the opponent-process theory.
Its the same reason why the same shade of grey in two different backgrounds might not look the same.
Retinex Theory of Colour Vision
A retina-cortex system may treat a color as a code for a three-part report from the retina, independent of the flux of radiant energy but correlated with the reflectance of objects.
