RT Journal Article SR Electronic T1 CEDRIC KEITH COHEN JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 592 OP 592 DO 10.1136/bjo.36.10.592 VO 36 IS 10 YR 1952 UL http://bjo.bmj.com/content/36/10/592.abstract AB