1. International Centre for Eye Health, Clinical Research Department, London School of Hygiene & Tropical Medicine, London, United Kingdom
2. Rwanda International Institute of Ophthalmology and Dr Agarwal’s Eye Hospital, Kigali, Rwanda
3. Department of Non-Communicable Disease Epidemiology, London School of Hygiene & Tropical Medicine, London, United Kingdom
4. Kitale Eye Unit and Trans Nzoia County, Kitale, Kenya
5. Ministry of Health, Nairobi, Kenya
6. MRC Tropical Epidemiology Group, Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine, London, United Kingdom
7. Moorfields Eye Hospital, London, United Kingdom