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From The Collaborative International Dictionary of English v.0.48:
Ophthalmoscope \Oph*thal"mo*scope\, n. [From Gr. 'ofqalmo`s the eye + -scope.] (Physiol.) An instrument for viewing the interior of the eye, particularly the retina. Light is thrown into the eye by a mirror (usually concave) and the interior is then examined with or without the aid of a lens. -- Oph*thal`mo*scop"ic, a. [1913 Webster]