[1] Int Ctr Eye Hlth, London Sch Hyg & Trop Med, London, England
[2] Univ Calif San Francisco, Dept Ophthalmol, San Francisco, CA USA
[3] Univ Auckland, Sch Populat Hlth, Auckland, New Zealand
[4] Kamuzu Univ Hlth Sci, Blantyre, Malawi
[5] Queen Elizabeth Cent Hosp, Blantyre, Malawi
[6] Univ Rwanda, Sch Hlth Sci, Ophthalmol Dept, Kigali, Rwanda
[7] Kenya Med Training Coll, Nairobi, Kenya
[8] Kenya Minist Hlth, Ophthalm Serv Unit, Nairobi, Kenya
[9] London Sch Hyg & Trop Med, Dept Populat Hlth, London, England
[10] Moorfields Eye Hosp NHS Fdn Trust, Natl Inst Hlth Res Biomed, UCL Inst Ophthalmol, Res Ctr Ophthalmol, London, England
[11] Univ Auckland, Sch Optometry & Vis Sci, Auckland, New Zealand