RT Journal Article SR Electronic T1 Insights from the Blind JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 68 OP 68 DO 10.1136/bjo.63.1.68 VO 63 IS 1 A1 A. G. Cross YR 1979 UL http://bjo.bmj.com/content/63/1/68.1.abstract AB