RT Journal Article SR Electronic T1 Handbook of Sensory Physiology JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 111 OP 112 DO 10.1136/bjo.59.2.111-c VO 59 IS 2 A1 Sanders, M. D YR 1975 UL http://bjo.bmj.com/content/59/2/111.4.abstract AB