How do we see Colour?

We receive colour through our eyes & if we go blind the body adapts and receives the colour rays through the skin only. The sensors known as rods are sensitive to low levels of light, while those known as cones require a greater intensity of light. Cones are sensitive to colour they create a much sharper image than rods. The area in the centre of the eye has the highest percentage of cones and these produce sharp images, whilst the rest of the retina contains mainly rods. The retina, optic nerve and brain forms a whole system called the eye brain.

Imagine that you are looking at a coloured blue beach ball; the 'invisible' full spectrum light shines on the ball. The surface of the blue ball absorbs the full spectrum rays, except those corresponding to blue. The colour blue is then reflected to the human eye & a message is sent to the brain.