A layer of cells on the inside of the eyeball, the retina is actually an extension of the brain. It is composed of nerve cells that connect to the brain. Rods, which perceive light intensity, and cones which perceive color, are two types of nerve cells found in the retina. Much of the rest of the eye functions solely to direct light to this important part of the eye. Since the retina is made up of lots of nerve cells, there is plenty of fat that is susceptible to oxidation.
Mitochondria are another source of free radicals in the eye.
Rods and cones are jammed with mitochondria, which generate the energy necessary to transform light into vision. If not enough antioxidants are present to grab the radicals, the retina can be damaged. The macula is located on the part of the retina that creates the sharpest vision. When the macula goes, vision goes as well. The macula is yellow.