RT Journal Article SR Electronic T1 Petrus Johannes Waardenburg, MD. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 224 DO 10.1136/bjo.64.3.224 VO 64 IS 3 A1 Williamson, K F YR 1980 UL http://bjo.bmj.com/content/64/3/224.abstract AB