In the Human eye there are twotypes

In the Human eye there are two
types of image receptor cells cones and rods.
Rods are helpful for seeing the image in low
light or in the dark whereas the cones work for
seeing the image in different colours. Both the
receptors cells are found in retina of human
eye. They contain three colour pigments Red, Green and Blue. In the Human vision there are
different stages which describe what type of
colour vision deficiency the people have.
Monochromacy (1%): Total colour blinded
Dichromacy (10%): Partial colour blinded (i)
red-green colour blindness (ii) blue-yellow
colour blindness. Trichromacy: Normal
colour vision. The Dichromacy, this type of
colour blindness mostly people have.