1) Ophthalmic equipment 
A keratometer, also known as a ophthalmometer, is a diagnostic instrument for measuring the curvature of the anterior surface of the cornea, particularly for assessing the extent and axis of astigmatism. It was invented by the German physiologist Hermann von Helmholtz in 1851, although an earlier model was developed in 1796 by Jesse Ramsden and Ev...
An instrument used to measure the curvature of the front surface of the cornea.
instrument for measuring curvature of the cornea
An instrument for measuring the curvature of the anterior corneal surface. ... Synonym: ophthalmometer. ... Origin: kerato-+ G. Metron, measure ... (05 Mar 2000) ... 
(ker″ә-tom´ә-tәr) an instrument for measuring the curves of the cornea.
Type: Term Pronunciation: ker′ă-tom′ĕ-tĕr Definitions: 1. An instrument for measuring the curvature of the anterior corneal surface. Synonyms: ophthalmometer
an instrument for measuring the curvature of the cornea.