Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan; Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland. Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan. Aravind Eye Hospital, Pondicherry, India. Lions Aravind Institute of Community Ophthalmology, Madurai, Tamil Nadu, India. Department of Epidemiology, University of Michigan, Ann Arbor, Michigan; Department of Biostatistics, University of Michigan, Ann Arbor, Michigan. Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan; Department of Epidemiology, University of Michigan, Ann Arbor, Michigan. Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan. Electronic address: mariawoo@med.umich.edu.