oph·thal·mo·scope 
(ŏf-thălmə-skōp′, ŏp-)
(ŏf-thălmə-skōp′, ŏp-)n.
An instrument for examining the interior structures of the eye, especially the retina, consisting essentially of a mirror that reflects light into the eye and a central hole through which the eye is examined.
oph·thal′mo·scopic (-skŏpĭk), oph·thal′mo·scopi·cal (-ĭ-kəl) adj.
oph′thal·mosco·py (ŏf′thăl-mŏskə-pē, ŏp′-) n.