@article{ref1,
title="An apparatus for determining acuity at low illuminations, for testing the light and color sense and for detecting small errors in refraction and in their correction",
journal="Journal of experimental psychology",
year="1920",
author="Ferree, C. E. and Rand, Gertrude",
volume="3",
number="1",
pages="59-71",
abstract="Describes the design and application of an apparatus that was devised in response to a request by the Eye Division of the U. S. Naval Hospital for a means of making a quick and accurate test of acuity at low illumination. Experience has shown, roughly speaking, that only 25-30 per cent, of the men on the battleships have a sufficiently keen acuity at low illuminations to qualify for all branches of the lookout and signal service work. The apparatus provides for a wide range of illumination in just noticeably different steps (beginning at 0.07 meter-candle or lower), with no change in the color value of the light and with a specification at each step of the intensity of light falling on the test-object. (PsycINFO Database Record (c) 2012 APA, all rights reserved)<p />",
language="",
issn="0022-1015",
doi="10.1037/h0067086",
url="http://dx.doi.org/10.1037/h0067086"
}