RT Journal Article SR Electronic T1 Pleoptik und Orthoptik JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 566 OP 566 DO 10.1136/bjo.58.5.566 VO 58 IS 5 A1 Ffytche, T. J. YR 1974 UL http://bjo.bmj.com/content/58/5/566.1.abstract AB