Submitted for Publication: August 23, 2011; final revision received December 2, 2011; accepted December 8, 2011.
Published Online: March 12, 2012. doi:10.1001/archophthalmol.2012.89
Author Contributions: Dr Berson had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Financial Disclosure: None reported.
Funding/Support: This work was supported in part by a center grant from the Foundation Fighting Blindness (Dr Berson).
Role of the Sponsors: This sponsor supported the collection of data but was not involved in the design or analysis of the study.
Previous Presentations: A portion of this work was presented at the Association for Research in Vision and Ophthalmology annual meeting; May 3, 2010; Fort Lauderdale, Florida; and the Aegean Retina Meeting; July 10, 2011; Rethymno, Crete, Greece.