A 'universal' apparatus for research in physiological optics.

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Abstract
The apparatus described in this paper was designed to provide a common exptl. matrix for the greatest possible variety of researches in physiological optics, such as studies of simultaneous contrast, Fechner-Benham colors, inter-ocular discrimination, some aspects of stereoscopic vision, adaptation, etc. The apparatus provides an independently controllable field of vision for each eye; each field of vision (diam., 18[degree]) is divisible into subregions of independently controllable luminosities. Episcotisters provide for intermittence of illumination of any desired frequency, and any desired phase relations between subregions. There is also provision for blurring of the field of vision to various known degrees by a method which obviates compensation by accomodatory readjustment.

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