PT - JOURNAL ARTICLE ED - BMJ Publishing Group Ltd.BMA House, Tavistock Square, London, WC1H 9JR TI - ABSTRACTS AID - 10.1136/bjo.24.4.189-a DP - 1940 Apr 01 TA - British Journal of Ophthalmology PG - 189--196 VI - 24 IP - 4 4099 - http://bjo.bmj.com/content/24/4/189.2.short 4100 - http://bjo.bmj.com/content/24/4/189.2.full SO - Br J Ophthalmol1940 Apr 01; 24