TY - CPAPER AU - Keay Lisa BT - Association for Research in Vision and Ophthalmology CY - Fort Lauderdale, USA, May LA - eng PP - Fort Lauderdale, USA, May PY - 2012 T2 - Association for Research in Vision and Ophthalmology TI - Improving balance and mobility in older people with vision impairment: protocol for a randomised controlled trial ER -