retinoscopy
/ˌrɛtɪˈnɒskəpi/Ophthalmology
noun
A method for determining the refraction of the eye by projecting a beam of light into it and observing the movements of the illuminated area of the retina and the light reflected back through the pupil.
- An earlier name for this method was keratoscopy; it was also called skiascopy..
Origin
Mid 19th century (in an earlier sense). From retino- + -scopy. In sense 2 after French rétinoscopie.