1. From the Aravind Medical Research Foundation, Aravind Eye Care System, Madurai, Tamilnadu, India; the
2. Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland; the3Dana Center for Preventive Ophthalmology, Johns Hopkins University Schools of Medicine and Public Health, Baltimore, Maryland; the
3. Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland; the4Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, Maryland.