RT Journal Article SR Electronic T1 Variation of Fixation Direction with Colour of Fixation Target JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 294 OP 297 DO 10.1136/bjo.39.5.294 VO 39 IS 5 A1 D. H. Fender YR 1955 UL http://bjo.bmj.com/content/39/5/294.abstract AB