Affiliation: | 1 Aravind Eye Care System, Madurai, India;2 Aravind Eye Care System, Coimbatore, India;3 F.I. Proctor Foundation, University of California, San Francisco, California;4 Department of Epidemiology & Biostatistics, University of California, San Francisco, California;5 Department of Ophthalmology, University of California, San Francisco, California |