1. The Eye

2. Rods and Cones The eye is made of cells that are called Rods and Cones. Cone cells are coned shaped and Rod cells are rod shaped.

3. Visual Acuity The Rod cells are more sensitive than the Cone cells but the Cone cells have a higher acuity than Rod cells.

4. Bleaching Bleaching occurs when you have looked at a red picture too long the red iodopsin has being bleached so when you look at white paper the red iodopsin is temporally out of order.

5. Colour Vision Rods cells have monochromatic vision and Cone cells have trichromatic vision. Cone cells see in bright light and Rod cells see in black and white and in dark light. There are three different coloured Cone cells. These are red, green and blue. There are an equal amount of coloured Cone cells in the eye. The Cone cells are all situated at the fovea.

6. Bipolar Cells Three Rod cells are connected to one bipolar cell which means that when only one of the Rod cells are activated an impulse is sent to the brain. One Cone cells is connected to one bipolar cell which means that the light needs activate each Cone cell to send an impulse. This is why the Cone cells have a higher acuity and why they cant function in the dark.