Parts of the eye
The front part of the eye is the cornea; this tough clear film is sensitive to foreign bodies and also bends the light as it enters the eye. We then come to the iris, the coloured part of the eye. The iris controls how much light enters the eye. The light then travels through the lens which focuses the light. It then travels through the vitreous humour, which is the gel in the middle. The light is then focused on the retina where we find cells called rods and cones. The rods and cones are light receptors - the rods are sensitive to dim light as well as black and white whereas the cones are sensitive to colour. Finally we reach the optic nerve, which sends this information to the brain.