manoptoscope

manoptoscope

Apparatus for determining the dominant eye. It consists of a hollow truncated cone that subjects hold with the base against their face and over both eyes. Subjects will view a distant object through the hole at the end of the cone, using their dominant eye. See ocular dominance.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann