RT Journal Article SR Electronic T1 Fundamentals of Visual Science JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 573 OP 573 DO 10.1136/bjo.54.8.573-a VO 54 IS 8 YR 1970 UL http://bjo.bmj.com/content/54/8/573.2.abstract AB