CATALO Extra Lutein Formula contains US patented ingredient FloraGLO Marigold extract (containing Lutein and Zeaxanthin), which is the ideal supplement to the macular the central area of the retina. Consumption of lutein-rich food promotes healthy vision, especially for those concerning presbyopia. Lutein is a major component of the macula lutea, absorbs blue light and acts as a filter that may reduce photochemical damage caused by short-wavelength visible light. Additionally, luteins powerful anti-oxidant properties may offer protection against light-induced oxidative damage by quenching reactive oxygen species. Studies showed that blood serum with good concentration of lutein is beneficial for visual acuity and quality of vision.