Light rays enter the eyes right through the cornea, pupil, and lense. These light rays pass through the vitreous, a clear gel like substance that feels the middle of the eye. The light rays focus on the retina, a light sensitive tissue lining the back of the eye. The macula is a very small area at the center of the retina that give us our fine pinpoint central vision. The area of the retina surrounding the macula gives us our peripheral vision or side vision. The retina converts light rays into signals, which are sent through the optic nerve to the brain.