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BMJ. 1992 May 9; 304(6836): 1226–1229.
PMCID: PMC1881785
Visual problems in the elderly population and implications for services.
R. P. Wormald, L. A. Wright, P. Courtney, B. Beaumont, and A. P. Haines
Department of Preventive Ophthalmology, Institute of Ophthalmology, London.