RT Journal Article SR Electronic T1 Evidently, evidence based. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 273 OP 274 DO 10.1136/bjo.80.4.273 VO 80 IS 4 A1 A R Fielder YR 1996 UL http://bjo.bmj.com/content/80/4/273.abstract AB