opsiometer
(ɒpsɪˈɒmɪtə(r))
[mod. f. Gr. ὄψι-ς sight + -ometer.]
= optometer.
| 1842 Brande Dict. Sci. etc., Opsiometer, an instrument for measuring the extent of the limits of distinct vision in different individuals, and consequently for determining the focal lengths of lenses necessary to correct imperfections of the eye. 1888 Public Opin. (Washington) 31 Mar., The ‘opsiometer’ is a new instrument for testing the eyesight. It consists of a mahogany case with two front eyeholes, behind which are two traveling bands mounted on rollers. |