RT Journal Article SR Electronic T1 Glaucoma screening by means of an optic disc grid. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 352 OP 355 DO 10.1136/bjo.67.6.352 VO 67 IS 6 A1 Hitchings, R A A1 Brown, D B A1 Anderton, S A YR 1983 UL http://bjo.bmj.com/content/67/6/352.abstract AB