orthoscope

from WordNet (r) 3.0 (2006)

orthoscope
    n 1: an ophthalmoscope with a layer of water to neutralize the
         refraction of the cornea

from The Collaborative International Dictionary of English v.0.48

Orthoscope \Or"tho*scope\, n. [Ortho- + -scope.] (Physiol.)
   An instrument designed to show the condition of the
   superficial portions of the eye.
   [1913 Webster]