Lutein and zeaxanthin, found together in many vegetables, are potent antioxidants. In humans, they occur in high concentrations in the eye, including the lens, retina, and macula. For that reason, lutein and zeaxanthin are thought to be crucial to healthy vision.
Eye-related benefits: Lutein and zeaxanthin protect the eyes from harmful high-energy light waves, such as some ultraviolet rays in sunlight. Studies suggest that high levels of lutein and zeaxathin in eye tissue are associated with better vision, especially in dim light or where glare is a problem. Diets rich in these two antioxidants appear to protect against age-related eye diseases. For example, one study found that people with diets high in foods rich in zeaxanthin -- particularly spinach, kale, and broccoli -- are up to 50% less likely to develop cataracts. A major study (called AREDS2) has shown that supplements containing lutein and zeaxanthin can slow the progression of macular degeneration if you already have it. A test called macular pigment optical density is now being used by eye care specialists to measure levels of lutein and zeaxanthin in eye tissue.
It is not possible to prevent chronic open-angle glaucoma, but early detection and effective treatment will prevent significant damage to the eyes and preserve your sight. All adults need an eye exam that includes tests for glaucoma every three to five years. These tests are usually done by an eye doctor -- either an optometrist or an ophthalmologist. If someone in your family has had glaucoma or if you have other risk factors for glaucoma, your doctor may suggest more frequent eye exams.