RT Journal Article SR Electronic T1 ABSTRACTS JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 173 OP 184 DO 10.1136/bjo.15.3.173 VO 15 IS 3 YR 1931 UL http://bjo.bmj.com/content/15/3/173.abstract AB