RT Journal Article SR Electronic T1 Changes in the Fundus Caused by Polycythaemia JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 380 OP 384 DO 10.1136/bjo.34.6.380 VO 34 IS 6 A1 Nagy, F. YR 1950 UL http://bjo.bmj.com/content/34/6/380.abstract AB