Sight

Sight is the incredibly complex process of conveying messages from the eye, to the brain. The first step of this process is for light to enter the cornea. The cornea is the bent clear part of the sclera directly in front of the colored part of the eye. It is clear so light may pass through it. As light passes through it, the cornea focuses the image before it is encoded into an electrical signal, passed through the iris and the pupil, and carried to the retina. The retina is a flat surface at the back of the eyeball, where the image is decoded to a flat image. The image is then encoded again as an electrical signal, and carried by the optic nerves that are connected to the retina, to the back of the eyeball, where the optic nerves form together as one long nerve. This long nerve carries the electrical signal to the brain where the message is decoded and analyzed for the last time. This is sight. Further information can be found at: www.sightsaversusa.org/learn_more/the_eye/11494.html