RT Journal Article SR Electronic T1 Ectopia lentis in Marfan's syndrome causing positional visual symptoms JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 484 OP 484 DO 10.1136/practneurol-2014-001078 VO 15 IS 6 A1 Prasad, Sashank YR 2015 UL http://pn.bmj.com/content/15/6/484.abstract AB