Did your parents ever tell you to eat carrots? Doctors believed then that the beta-carotene found in carrots was necessary for good eye sight and night vision. This is partial true as beta carotene is not only the carotenoids found in our body. It is actually important to eat corn, green leafy vegetables and collard greens because they contain high levels of carotenoids called lutein and zeaxanthine.
Because lutein and zeaxanthine are yellow, they efficiently absorb the blue light portion of visible light. Blue light is the major high energy light that can damage the lens and macula, our eyes absorb blue light and minimize oxidative stress. They essentially act like internal sunglasses. They screen out the harmful high energy light and decrease the number of free radicals that the photo receptor cells produce. There nutrients are also very potent antioxidants and as such are able to help neutralize any free radicals that occur in this area of the eye.