RT Journal Article SR Electronic T1 BROWNLOW RIDDELL JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 173 OP 173 DO 10.1136/bjo.12.3.173 VO 12 IS 3 YR 1928 UL http://bjo.bmj.com/content/12/3/173.abstract AB