The retina is the tissue lining the inside of the eye. It is a light-sensitive tissue that lines most of the eye, excluding the clear front part of the eye (the cornea). It is easiest to think of the eye as a camera. The cornea is the clear part or the lens of the cam-era, and the retina is the film.
Images enter through the clear part of the eye and when they strike the retina, they stimulate impulses, which are transmitted through the optic nerve to the brain. The brain then interprets these impulses into images. If the film in a camera is bad or damaged, the images are not clear.Similarly, if the retina is damaged, as in macular degeneration, the images are not clear.