A few additional nutrients that are important for improved vision are also important. Among these are the carotenoids lutein and zeaxanthin, which are present in the retina. They're also in leafy green vegetables, broccoli, zucchini, and eggs. Lutein and zeaxanthin supplements are also available. There is some evidence that supplementing with these substances may help prevent or treat age-related macular degeneration, but more research is needed. The good news is that you can take steps now to ensure you get enough of these nutrients. The key is to eat a healthy diet full of fruits and vegetables and include some protein with each meal. Your body uses what it needs from day to day. If you don't give it anything extra, there's no need to worry about repairing damaged tissue. However, if you do have excess light exposure or suffer from macular degeneration, then you might want to consider taking supplements.