Blepharitis Chalazion Conjunctivitis Corneal Erosions Cataracts Diabetic Retinopathy Eyelid Spasms Flashers and Floaters Glaucoma Glossary How to apply eyedrops The Human Eye Keratoconus LASIK Macular Degeneration Pterygium and Pinguecula Radial Keratotomy Refractive Surgeries Strabismus Visual Field Test	The Human Eye Healthy Eye (side view) Healthy Retina (front view) Cornea -- a protective, clear film that, like a window, lets light into the eye  Go back Lens -- a flexible, clear mass that focuses light coming into the eye  Go back Vitreous -- a gel-like material that fills the eye and gives it structure; also called the vitreous humor  Go back Optic Nerve -- the main nerve through which visual signal are sent from the retina to the brain, where the signals are processed as vision  Go back Iris -- muscles of the eye which alter the lens to allow the eye to focus; it is the iris that give an eye its color  Go back Retina -- cell layers at the back of the eye which translate light into nerve signals, and passes them onto the optical nerve  Go back Macula -- area within the retina, where central, focused vision is processed  Go back Fovea -- the center of the macula  Go back Blood Vessels -- these are tiny, and the blood that flows through them carry nutrients and oxygen to the retina, and carry wastes away  Go back Periphery -- the outer part of the retina, where night vision and peripheral vision are processed  Go back Go to Top