TY - JOUR T1 - Key Facts in Ophthalmology JF - British Journal of Ophthalmology JO - Br J Ophthalmol SP - 474 LP - 474 DO - 10.1136/bjo.69.6.474-c VL - 69 IS - 6 AU - Z Gregor Y1 - 1985/06/01 UR - http://bjo.bmj.com/content/69/6/474.4.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -