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Webster 1913 Edition

Noun.

[Gr.

ὀφθαλμόσ

eye +

-meter

(Physiol.)

An instrument devised by

Helmholtz

for measuring the size of a reflected image on the convex surface of the cornea and lens of the eye, by which their curvature can be ascertained.

ophthalmometer ‎(plural ophthalmometers)

(physiology) An instrument for measuring the size of a reflected image on the convex surface of the cornea and lens of the eye, by which their curvature can be ascertained.