RT Journal Article SR Electronic T1 Physiology of the Retina and Visual Pathway JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 502 OP 502 DO 10.1136/bjo.55.7.502 VO 55 IS 7 YR 1971 UL http://bjo.bmj.com/content/55/7/502.1.abstract AB