RT Journal Article SR Electronic T1 Harold Pace Gibb JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 64 OP 64 DO 10.1136/bjo.40.1.64 VO 40 IS 1 A1 J. D. M. Cardell YR 1956 UL http://bjo.bmj.com/content/40/1/64.abstract AB