The act of refracting, or the state of being refracted.
- The turning or bending of any wave, such as a light or sound wave, when it passes from one medium into another of different optical density.
- Astronomy The apparent change in position of celestial objects caused by the bending of light rays entering Earth's atmosphere.
- Medicine The ability of the eye to bend light so that an image is focused on the retina.
- Medicine Determination of the refractive characteristics of the eye.