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Meaning of retinoscope

ret•i•no•scope

Pronunciation: (ret'n-u-skōp"), [key]
— n. Ophthalm.
  1. an apparatus that determines the refractive power of the eye by observing the lights and shadows on the pupil when a mirror illumines the retina; skiascope.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.