Ocular Refraction.

The science treating of theoptical conditions of the eye, the estimationofits errors of refraction and their connectionwith lenses for the eye.

Source: Ophthalmic Dictionary including pronunciation, derivation and definition of the words used in Optometry and Ophthalmology by James J. Lewis, Oph. D. Professor of Optometry in the Northern Illinois College of Ophthalmology and Otology, Chicago.