(formerly) an instrument for examining the internal structures of the eye through a layer of water that neutralizes the refraction of the cornea.
Origin of orthoscope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
med obsolete a 19th-century instrument for viewing the fundus of the eye through a layer of water, which eliminates distortion caused by the cornea
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
An instrument used to examine the eye that eliminates corneal refraction by means of a layer of water.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.