Colour-blindness is colour vision deficiency, wherein certain colours particularly reds and greens cannot be distinguised in most common cases. At the back of our eyes we have cones and rods. Cones pick up colour and rods pick up brightness, Cones contain single visual pigments selective for red, green and blue light. They pick up different wavelengths of light. Colour blind people either have less numbers of particular cones than normal or reduced amount of pigment per cone. So they get colours confused. Most of the colour blind people are red green colour vision deficient. It does not mean they see in black and white or blue monochrome but they confuse red, green and brown colours and also blue and purple, but this all depends on the intensity of the colour and the brightness of the light conditions at that time.
展开▼
