References:
1.Age-Related Eye Disease Study Research Group. A Randomized, Placebo-Controlled, Clinical Trial of High-Dose Supplementation With Vitamins C and E, Beta Carotene, and Zinc for Age-Related Macular Degeneration and Vision Loss: AREDS Report No. 8. Arch Ophthalmol. 2001 Oct. http://www.ncbi.nlm.nih.gov/pubmed/11594942 and http://www.nei.nih.gov/news/pressreleases/101201.asp
2.Kansagara D, Gleitsmann K, Gillingham M, Freeman M, Quiñones A. Nutritional Supplements for Age-related Macular Degeneration: A Systematic Review. VA-ESP Project #05-225; 2011. http://www.ncbi.nlm.nih.gov/books/NBK84269/
3.Jacob RA, Sotoudeh G. Vitamin C function and status in chronic disease. Nutr Clin Care. 2002 Mar-Apr;5(2):66-74. http://www.ncbi.nlm.nih.gov/pubmed/12134712?dopt=Abstract