1. The prevention of blindness: Report of a WHO Study Group;World Health Organisation,1973
2. The prevention of blindness;World Health Organisation;WHO Chron,1976
3. Programme Advisory Group on the Prevention of Blindness. Data on blindness throughout the world;WHO;WHO Chron,1979
4. Prevention of blindness: the current focus;Thylefors, B.;WHO Chron,1985
5. Cataract and corneal opacity are the main causes ofblindness in the Samburu tribe ofKenya;Whitfield, R.; Schwab, L.; Bakker, N.J.A.; Bisley, G.G.; RossDegnan, D.;Ophthalmic Surg,1983