The retina is a thin, light-sensitive tissue that lines the back of the eye. It contains 10 layers including photoreceptors that convert light into neural signals. The macula contains the highest concentration of cones and allows for sharp, central vision. The optic disc is where retinal blood vessels and optic nerve fibers exit the eye. The retina receives dual blood supply from the central retinal artery and choroidal vessels. It contains over 120 million light-sensitive rods and cones and transmits visual information through the optic nerve to the brain.