1. Randomized controlled trial of anterior chamber lenses;Hennig;Lancet,1997
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3. Vision 2020—the right to sight;Pararajasegaram;Am J Ophthalmol,1999
4. World Health Organization (WHO): Program for prevention of blindness. Report of the consultation on the use of intraocular lenses in cataract surgery in the developing countries. WHO/PBL/91-1, Geneva, Dec 3–7, 1990