Lutein 20,000 mcg (20 MG) is a carotenoid abundant in fruits and vegetables, and is also a potent antioxidant highly concentrated in the macula of the eye (the back part of the retina where entering light hits and sends signals to the brain for sight).
Research shows that lutein can serve as your body's own internal sunglasses helping to block out visible blue light, the major cause of photic (light induced) damage to the eye. The problem is as we age our supply of lutein dwindles.