A recent study suggests eating a handful or two of nuts a week could cut back on the risk of blindness in elderly by about 35 percent. Researchers at the University of Sydney said foods that have a lot of omega-3 fatty acids can greatly reduce the risk of age-related macular degeneration, a common eye condition in the elderly that leads to blindness.

Like nuts, fish also carried a decreased risk of contracting ARMD. A weekly serving of fish cut back on the risk by 31 percent. Researchers believe the fatty acids build up a protective layer that defended against plaque build-up.