@article{ref1,
title="Use of single-vision eyeglasses improves stepping precision and safety when elderly habitual multifocal wearers negotiate a raised surface",
journal="Journal of the American Geriatrics Society",
year="2008",
author="Johnson, L. and Buckley, John G. and Harley, Clare and Elliott, D. B.",
volume="56",
number="1",
pages="178-180",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0002-8614",
doi="10.1111/j.1532-5415.2007.01485.x",
url="http://dx.doi.org/10.1111/j.1532-5415.2007.01485.x"
}