1. Faculty of Infectious & Tropical Diseases, London School of Hygiene & Tropical Medicine, Keppel Street, London WC1E 7HT, England.
2. Health, Rights and Development, School of Social Sciences, University of New South Wales, Sydney, Australia.
3. World Health Organization, Bogotá, Colombia.
4. Department of Clinical Medicine, Kenya Medical Training College, Nairobi, Kenya.
5. Department of Ophthalmology, Kitale County and Referral Hospital, Kitale, Kenya.
6. Ophthalmic Services Unit, Ministry of Health, Nairobi, Kenya.
7. Christian Blind Mission, Cambridge, England.