TY - JOUR T1 - ABSTRACTS JF - British Journal of Ophthalmology JO - Br J Ophthalmol SP - 528 LP - 531 DO - 10.1136/bjo.28.10.528 VL - 28 IS - 10 AU - A. F. MacCallan AU - F. A. W-N. Y1 - 1944/10/01 UR - http://bjo.bmj.com/content/28/10/528.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -