Bible Dictionaries
Opsiometer
Webster's Dictionary
(n.) An instrument for measuring the limits of distincts vision in different individuals, and thus determiming the proper focal length of a lens for correcting imperfect sight.
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Bibliography Information
Webster, Noah. Entry for 'Opsiometer'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/o/opsiometer.html. 1828.