RT Journal Article SR Electronic T1 JOHN ROWAN JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 382 OP 384 DO 10.1136/bjo.32.6.382 VO 32 IS 6 YR 1948 UL http://bjo.bmj.com/content/32/6/382.abstract AB