<p><strong>Noun:</strong></p><ul><li>The change of direction of a ray of light, sound, heat, or the like, in passing obliquely from one medium into another in which its wave velocity is different.</li><li><strong>Ophthalmology:</strong> The ability of the eye to refract light that enters it so as to form an image on the retina.</li><li>The determining of the refractive condition of the eye.</li><li><strong>Astronomy:</strong> Also called astronomical refraction, the amount, in angular measure, by which the altitude of a celestial body is increased by the refraction of its light in the earth's atmosphere, being zero at the zenith and a maximum at the horizon.</li><li>The observed altered location, as seen from the earth, of another planet or the like due to diffraction by the atmosphere.</li></ul><p><strong>End of Response</strong></p>