Silver Book Fact
In one study of patients age 48 and older, 17% of the women and 11.1% of the men had dry eye.
Moss S, Klein R, Klein B. Prevalence of and Risk Factors for Dry Eye Syndrome. Archives of Ophthalmology. 2000; 118(9): 1264-8. http://archopht.ama-assn.org/cgi/content/abstract/118/9/1264