TY - JOUR T1 - Lecture Notes on Ophthalmology JF - British Journal of Ophthalmology JO - Br J Ophthalmol SP - 801 LP - 801 DO - 10.1136/bjo.65.11.801-a VL - 65 IS - 11 AU - G. V. Catford Y1 - 1981/11/01 UR - http://bjo.bmj.com/content/65/11/801.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -