noun, plural: refractions
(1) (physics) The bending of wave (e.g. light) as it travels through a refractive medium.
(2) The measure of change in the direction of a wave that travels across two media of dissimilar refractive indexes.
(3) (ophthalmology) The capacity (of the eye) to refract light.
In ophthalmology, the ability of the eyes to refract light is measured and evaluated to determine if there is a need to prescribe the use of corrective lenses.
Related form(s): refract (verb), refractive (adjective)