RT Journal Article SR Electronic T1 OPHTHALMOLOGICAL SOCIETY OF THE UNITED KINGDOM JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 251 OP 252 DO 10.1136/bjo.28.5.251 VO 28 IS 5 YR 1944 UL http://bjo.bmj.com/content/28/5/251.abstract AB