RT Journal Article SR Electronic T1 WILLIAM GORDON MATTHEW BYERS JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 192 OP 192 DO 10.1136/bjo.42.3.192 VO 42 IS 3 YR 1958 UL http://bjo.bmj.com/content/42/3/192.abstract AB