RT Journal Article SR Electronic T1 Ophtalmologie JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 511 OP 511 DO 10.1136/bjo.68.7.511-a VO 68 IS 7 A1 James R. Hudson YR 1984 UL http://bjo.bmj.com/content/68/7/511.2.abstract AB