RT Journal Article SR Electronic T1 Corrigendum JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 428 OP 428 DO 10.1136/bjo.28.8.428 VO 28 IS 8 YR 1944 UL http://bjo.bmj.com/content/28/8/428.abstract AB