At the back of the eye, a few millimeters toward the nose from center, is the optic nerve. The optic nerve connects the eye to the brain and relays information about sight.

Photoreceptors receive light waves and instantly convert the information to electrical impulses. These electric signals travel from cell to cell along microscopic nerve fibers, being processed and analyzed along the way. Eventually, the nerve fibers and their information, in the form of electrical impulses, converge. Thousands of signals then travel the length of the optic nerve to the brain, where they are processed and understood.