Sisu Lutein - 20 mg - The most prevalent carotenoid in the eye is naturally deposited as a protective layer in the macula, a small spot in the back of the eye responsible for central vision. A healthy lutein layer shields the macula from damaging UV light and can improve our ability to react to bright flashes of light, to see more clearly in low light conditions, and improve reaction time – critical to driving at night or enjoying outdoor sports.