RT Journal Article SR Electronic T1 Correction JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 679 OP 679 DO 10.1136/bjo.80.7.679-a VO 80 IS 7 YR 1996 UL http://bjo.bmj.com/content/80/7/679.2.abstract AB