Opsiometer Definition

noun

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

Wiktionary

Other Word Forms of Opsiometer

Noun

Singular:
opsiometer
Plural:
opsiometers

Origin of Opsiometer

  • Ancient Greek; compare French opsiomètre.

    From Wiktionary

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opsiometer