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Webster 1913 Edition

Opsiometer

Opˊsi-om′e-ter

,
Noun.
[Gr. [GREEK] sight +
-meter
: cf. F.
opsiomètre
.]
An instrument for measuring the limits of distinct vision in different individuals, and thus determiming the proper focal length of a lens for correcting imperfect sight.
Brande & C.

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