TY - JOUR T1 - ALEXANDER DEWAR WILLIAMSON JF - British Journal of Ophthalmology JO - Br J Ophthalmol SP - 63 LP - 64 DO - 10.1136/bjo.42.1.63 VL - 42 IS - 1 A2 - , Y1 - 1958/01/01 UR - http://bjo.bmj.com/content/42/1/63.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -