OPSIOMETER

Etymology

Noun

opsiometer (plural opsiometers)

An old instrument for measuring vision and determining the focal length of a lens that can correct an individual's imperfect eyesight.

Anagrams

• opisometer

Source: Wiktionary


Op`si*om"e*ter, n. Etym: [Gr. -meter: cf. F. opsiomètre.]

Definition: 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. Brande & C.

Source: Webster’s Unabridged Dictionary 1913 Edition



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