An estimated 6.5% of Americans age 40 and older have age-related macular degeneration (AMD).
Klein R, Chou C, Klein B, Zhang X. Prevalence of Age-Related Macular Degeneration in the U.S. Population. Arch Ophthalmol. January 2011; 129(1): 75-80. http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cts=1330977849323&ved=0CDoQFjAC&url=http%3A%2F%2Farchopht.ama-assn.org%2Fcgi%2Fcontent%2Ffull%2F129%2F1%2F75&ei=NhxVT7f9N8W30AHSq6C8DQ&usg=AFQjCNGXJ3281XFLb-OelB4n3njSRegX2g