In various studies and clinical trials, antioxidant vitamins such as vitamins A, C and E can help maintain healthy cells and tissues in the eyes. These vitamins are found in fruits and vegetables such as oranges, tomatoes, kale and spinach. Two key protective antioxidants are lutein and zeaxanthin, which also help to protect against macular degeneration and free radical damage. Omega 3 fatty acids are essential for nerve conduction in the retina. For healthy eyes, eat a good and balanced diet with lots of fresh fruits and vegetables, with oily fish like salmon, sardine or mackerel.