(medicine) An instrument for examination of the eye through a layer of water, whereby the curvature and hence the refraction of the cornea is neutralized. An instrument used in drawing the projections of skulls.
(optics) A polarizing microscope in which light is transmitted by a crystal which is parallel to the microscope axis.
An instrument used to examine the eye that eliminates corneal refraction by means of a layer of water.
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An apparatus that neutralizes the corneal refraction by means of a layer of water; used in ocular examinations.