ophthalmoscope
Oph*thal"mo*scope, n. Etym: [From Gr. -scope.] (Physiol.) Defn: 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.