RT Journal Article SR Electronic JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 1214 OP 1214 DO 10.1136/bjo.83.11.1214 VO 83 IS 11 YR 1999 UL http://bjo.bmj.com/content/83/11/1214.abstract AB