These peppers are the best dietary source of zeaxanthin, the other carotenoid that concentrates in the back of the eye. The higher the level of carotenoids like lutein and zeaxanthin, the lower the risk for cataracts and macular degeneration. Orange bell peppers have a lot of vitamin C and more zeaxanthin per mouthful than any food on the planet, Pratt says. Other orange foods — including gogi berries, pumpkin, squash, sweet potatoes and carrots — may have similar benefits. These orange-colored choices also are chock-full of vitamin A, which boosts night vision. And they contain a carotene that helps lower the risk of cataracts.