What is colour Blindness ?

Q: What is colour Blindness ?

Sol: Colour blindness is the eye defect due to which the colour-blind person is unable to distinguish between certain colours. This is due to absence of some cone cells that respond to certain colour. Colour blindness is genetic disorder. It cannot be cured. The red-green color blind person is not able to distinguish between red and green colours. However, colour-blind person can see other perfectly well.