RT Journal Article SR Electronic T1 William Zentmayer JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 576 OP 576 DO 10.1136/bjo.42.9.576 VO 42 IS 9 YR 1958 UL http://bjo.bmj.com/content/42/9/576.abstract AB