Silver Book Fact
Supplementation with lutein increases macular pigment optical density by 27%; which is correlated with benefits in visual function.
Weigert G, Kay S, Pemp B, Sacu S, et al. Effects of Lutein Supplementation on Macular Pigment Optical Density and Visual Acuity in Patients with Age-Related Macular Degeneration. Invest Ophthalmol Vis Sci. October 2011; 52(11): 8174-8. http://www.iovs.org/content/52/11/8174.abstract