1. Sorsby A. Reports on Public Health and Medical Subjects. No 114. London: Her Majesty's Stationary Office, 1966.
2. Statistics on Blindness in the Model Reporting Area. 1969–1970;Kahn,1973
3. National Advisory Eye Council. Report of the Retinal and Choroidal Diseases Panel. Vision Research-A National Plan: 1983–1987. Bethesda, MD: U.S. Department of Health and Human Services; 1984.
4. National Advisory Eye Council. Report of the Cataract Panel. Vision Research—A National Plan: 1983–1987. Bethesda, MD: U.S. Department of Health and Human Services; 1984.
5. Global data on blindness;Thylefors;Bull WHO,1995