Zeaxanthin

Zeaxanthin is an antioxidant carotenoid that may help prevent a leading cause of blindness among older people: macular degeneration.
The macula is a tiny dimple on the retina that is responsible for fine vision. Damage to the macula can cause blurry vision, or a dark spot in the field of vision. It can eventually lead to a loss of central vision, which can make it impossible to read, drive, or operate a computer. There is no cure for macular degeneration, but in some cases surgery may help to slow its progress. Free radical damage from ultraviolet radiation is believed to be a contributing factor, if not the cause, of macular degeneration. In fact, studies have shown lower than normal blood levels of protective antioxidants in people who develop macular degeneration.