Submitted for Publication: February 11, 2011; final revision received August 12, 2011; accepted September 12, 2011.
Financial Disclosure: None reported.
Funding/Support: Funding for this research was provided through a Physician Scientist Award from Research to Prevent Blindness (Dr Pasquale) and National Institutes of Health grant R01 EY015473 (Dr Pasquale).
Previous Presentation: This work was presented at the 2011 American Glaucoma Society Meeting; March 4, 2011; Dana Point, California.
Additional Contributions: We thank Nathan Congdon, MD, MPH, and Benita O'Colmain, MPH, PhD, for providing unpublished data on visual impairment epidemiology.