[1] Univ Sao Paulo, Ribeirao Preto Med Sch, Div Ophthalmol, Ribeirao Preto, Brazil
[2] HelpMeSee, New York, NY USA
[3] Inst Mexicano Oftalmol, Queretaro, Mexico
[4] London Sch Hyg & Trop Med, Int Ctr Eye Hlth, London, England
[5] Univ Auckland, Sch Optometry & Vis Sci, Auckland, New Zealand
[6] Pan Amer Hlth Org, Eye Care Program, Bogota, Colombia
[7] Univ New South Wales, Brien Holden Vis Inst, Sydney, NSW, Australia
[8] Univ New South Wales, Sch Optometry & Vis Sci, Sydney, NSW, Australia