RT Journal Article SR Electronic T1 CORRIGENDUM JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 496 OP 496 DO 10.1136/bjo.2.9.496 VO 2 IS 9 YR 1918 UL http://bjo.bmj.com/content/2/9/496.abstract AB