Normal Concept : For colour vision, our normal human eyes have 3 cones and photoreceptors. L cone - sensitive to long wavelength of yellowish green light M cone - middle wavelength of green light s cone - short wavelength to bluish violet light Protonapia - complete absence of red cone photoreceptors.He felt difficulty in identifying the red colour Deuteranopia - complete absence of green cone photoreceptors.He felt difficulty in identifying green colour Red green colour discrimination is called red- green dichromat vision blindness.He can able to see yellow circles sometimes in place of red or green colour, it shows the unstable working colour vision receptors. If one colour dominates the vision, the other will be absent,for instance, if red hue is dominant, it strikes the receptors of green colour and vice versa. Red green dichromat friend will have reduction view in the normally appearing red - green colour.The hues, he perceives was not like normal, it looks fade olive in colour.This is due to specific absence of photoreceptors. If he able to perceive colours, either one of the phoreceptors work in exitatory state and the other in inhibitory state.This is called opponent colour theory. Of all that, he might have some degeneration or improper formation issues with myelin sheath(covering the axon of a neuron) which is responsible for colour determination. Solution Normal Concept : For colour vision, our normal human eyes have 3 cones and photoreceptors. L cone - sensitive to long wavelength of yellowish green light M cone - middle wavelength of green light s cone - short wavelength to bluish violet light Protonapia - complete absence of red cone photoreceptors.He felt difficulty in identifying the red colour Deuteranopia - complete absence of green cone photoreceptors.He felt difficulty in identifying green colour Red green colour discrimination is called red- green dichromat vision blindness.He can able to see yellow circles sometimes in place of red or green colour, it shows the unstable working colour vision receptors. If one colour dominates the vision, the other will be absent,for instance, if red hue is dominant, it strikes the receptors of green colour and vice versa. Red green dichromat friend will have reduction view in the normally appearing red - green colour.The hues, he perceives was not like normal, it looks fade olive in colour.This is due to specific absence of photoreceptors. If he able to perceive colours, either one of the phoreceptors work in exitatory state and the other in inhibitory state.This is called opponent colour theory. Of all that, he might have some degeneration or improper formation issues with myelin sheath(covering the axon of a neuron) which is responsible for colour determination..

1. Normal Concept : For colour vision, our normal human eyes have 3 cones and photoreceptors.
L cone - sensitive to long wavelength of yellowish green light
M cone - middle wavelength of green light
s cone - short wavelength to bluish violet light
Protonapia - complete absence of red cone photoreceptors.He felt difficulty in identifying the red
colour
Deuteranopia - complete absence of green cone photoreceptors.He felt difficulty in identifying
green colour
Red green colour discrimination is called red- green dichromat vision blindness.He can able to
see yellow circles sometimes in place of red or green colour, it shows the unstable working
colour vision receptors.
If one colour dominates the vision, the other will be absent,for instance, if red hue is dominant, it
strikes the receptors of green colour and vice versa.
Red green dichromat friend will have reduction view in the normally appearing red - green
colour.The hues, he perceives was not like normal, it looks fade olive in colour.This is due to
specific absence of photoreceptors.
If he able to perceive colours, either one of the phoreceptors work in exitatory state and the other
in inhibitory state.This is called opponent colour theory.
Of all that, he might have some degeneration or improper formation issues with myelin
sheath(covering the axon of a neuron) which is responsible for colour determination.
Solution
Normal Concept : For colour vision, our normal human eyes have 3 cones and photoreceptors.
L cone - sensitive to long wavelength of yellowish green light
M cone - middle wavelength of green light
s cone - short wavelength to bluish violet light
Protonapia - complete absence of red cone photoreceptors.He felt difficulty in identifying the red
colour
Deuteranopia - complete absence of green cone photoreceptors.He felt difficulty in identifying
green colour
Red green colour discrimination is called red- green dichromat vision blindness.He can able to
see yellow circles sometimes in place of red or green colour, it shows the unstable working
colour vision receptors.
If one colour dominates the vision, the other will be absent,for instance, if red hue is dominant, it

2. strikes the receptors of green colour and vice versa.
Red green dichromat friend will have reduction view in the normally appearing red - green
colour.The hues, he perceives was not like normal, it looks fade olive in colour.This is due to
specific absence of photoreceptors.
If he able to perceive colours, either one of the phoreceptors work in exitatory state and the other
in inhibitory state.This is called opponent colour theory.
Of all that, he might have some degeneration or improper formation issues with myelin
sheath(covering the axon of a neuron) which is responsible for colour determination.