RT Journal Article SR Electronic T1 Vision screening JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 704 OP 705 DO 10.1136/bjo.2008.146167 VO 93 IS 6 A1 Jennifer Evans A1 Liam Smeeth A1 Astrid Fletcher YR 2009 UL http://bjo.bmj.com/content/93/6/704.abstract AB