RT Journal Article SR Electronic T1 Head mounted video magnification devices for low vision rehabilitation: a comparison with existing technology JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 495 OP 500 DO 10.1136/bjo.83.4.495 VO 83 IS 4 A1 ROBERT HARPER A1 LOUISE CULHAM A1 CHRISTINE DICKINSON YR 1999 UL http://bjo.bmj.com/content/83/4/495.abstract AB