RT Journal Article SR Electronic T1 Association between heavy computer users and glaucomatous visual field abnormalities JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 711 OP 711 VO 59 IS 8 A1 Leung, King-Sai YR 2005 UL http://jech.bmj.com/content/59/8/711.1.abstract AB