Op′si‐om″e‐ter (?), n. [Gr. � 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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.