retinoscopy

noun

ret·​i·​nos·​co·​py ˌre-tə-ˈnä-skə-pē 

plural retinoscopies

: observation of the retina of the eye especially to determine the state of refraction

Word History

First Known Use

1880, in the meaning defined above

Medical Definition

retinoscopy

noun

ret·​i·​nos·​co·​py ˌret-ᵊn-ˈäs-kə-pē 

plural retinoscopies

: a method of determining the state of refraction of the eye by illuminating the retina with a mirror and observing the direction of movement of the retinal illumination and adjacent shadow when the mirror is turned

retinoscopic

ˌret-ᵊn-ə-ˈskäp-ik 

adjective