RT Journal Article SR Electronic T1 A British ophthalmological surveillance unit JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 932 OP 933 DO 10.1136/bjo.81.11.932 VO 81 IS 11 A1 M R STANFORD YR 1997 UL http://bjo.bmj.com/content/81/11/932.abstract AB