RT Journal Article SR Electronic T1 CIRCULATION JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 42 OP 44 DO 10.1136/bjo.14.1.42 VO 14 IS 1 A1 Richard Kerry YR 1930 UL http://bjo.bmj.com/content/14/1/42.abstract AB