Submitted for Publication: October
30, 2011; final revision received April 27, 2012; accepted May 2,
Financial Disclosure: None reported.
Funding/Support: This research was
supported in part by an unrestricted grant from Research to Prevent
Blindness Inc and a grant from the Paul Family.
Additional Contributions: We thank
Joshua Boesche, BS, from the Division of Engineering, Mayo Clinic,
Rochester, Minnesota, for guidance on performing image analysis using