orthoscope

/ˈɔrθəˌskoʊp/
noun
  1. A medical instrument used to examine the inside of the eye, especially the retina, by shining a light through the pupil.
    • During the eye exam, the orthoscope revealed a small spot on the retina that needed further testing.
    • The eye doctor used an orthoscope to check the health of the patient's retina.
    • Modern orthoscopes have bright LED lights that make it easier to see the back of the eye.
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