RT Journal Article SR Electronic T1 Proceedings of the XXI International Congress of Ophthalmology, Mexico, 1970. Parts 1 and 2 JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 215 OP 215 DO 10.1136/bjo.57.3.215-a VO 57 IS 3 YR 1973 UL http://bjo.bmj.com/content/57/3/215.2.abstract AB