@article{ref1,
title="What is visual acuity?",
journal="Australian journal of optometry",
year="1959",
author="Burton, Russell G.",
volume="42",
number="10",
pages="430-432",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0045-0642",
doi="10.1111/j.1444-0938.1959.tb00094.x",
url="http://dx.doi.org/10.1111/j.1444-0938.1959.tb00094.x"
}