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]