The Collaborative International Dictionary
Skiascopy
Skiascope \Ski"a*scope\, Sciascope \Sci"a*scope\, n. [Gr. ? a shadow + -scope.] (Med.) A device for determining the refractive state of the eye by observing the movements of the retinal lights and shadows. -- Ski*as"co*py, Ski*as"co*py, n.
Wiktionary
skiascopy
n. retinoscopy