RT Journal Article SR Electronic T1 Examination of the central visual field at a reading distance. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 408 OP 414 DO 10.1136/bjo.52.5.408 VO 52 IS 5 A1 V. N. Highman YR 1968 UL http://bjo.bmj.com/content/52/5/408.abstract AB