What is The Retina?
The Retina is at the back of the eye, and is the part of the eye that is responsible for detecting light and dark, as well as colour.
When these rods and cones are exposed to light they each transmit a signal through the Optic Nerve (The Light Spot at the Centre of the Diagram), which is then processed by the brain.
This remarkable system of perceiving light can distinguish between over 120 million colours, in normal vision.
The Human eye is in fact an external portion of the brain, and normally in humans the eye is also responsible form more than 90% of the sensual input to the brain.
See Also :