[1] UCL, Inst Ophthalmol, London, England
[2] Moorfields Eye Hosp, London, England
[3] Kings Coll London, Dept Ophthalmol, London, England
[4] Medmetrics Inc, Ottawa, ON, Canada
[5] Minist Hlth Community Dev Gender Elderly & Childr, Natl Eye Care Program, Dodoma, Tanzania
[6] Dr Agarwals Eye Hosp, Dar Es Salaam, Tanzania