Substance that inhibits oxidation and can guard the body from damaging effects of free radicals. Molecules with one or more unpaired electrons, free radicals can destroy cells and play a role in many diseases. Antioxidant vitamins include B, C and beta carotene. Shown here are bilberries, which are high in antioxidants. Antioxidants may help prevent macular degeneration and other eye diseases; many studies are in progress. More about nutrition and the eyes.