instrument for measuring the eye
• (n.) 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.
(from the article `Helmholtz, Hermann von`) Among Helmholtz` most valuable inventions were the ophthalmoscope and the ophthalmometer (1851). While doing work on the eye, and incidentally ...
(of″thәl-mom´ә-tәr) an instrument used in ophthalmometry.
Oph`thal·mom'e·ter noun [ Greek 
Type: Term Pronunciation: of′thal-mom′ĕ-tĕr Synonyms: keratometer
An ophthalmometer is an instrument invented by Helmholtz for measuring the size of a reflected image on the convex surface of the cornea and lens of the eye, from which their curvature can be ascertained.
ophthalmometer 1. An instrument for measuring the reflection of an image on the surface of the cornea and other capacities of the eye, used chiefly for determining the presence and degree of astigmatism. 2. 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 curvatures c...
an instrument for measuring the reflection of an image on the surface of the cornea and other capacities of the eye, used chiefly for determining the presence and degree of astigmatism.