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From The Collaborative International Dictionary of English v.0.48:
Ophthalmometer \Oph`thal*mom"e*ter\, n. [Gr. 'ofqalmo`s 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. [1913 Webster]