refraction

refraction is a topic covered in the Taber's Medical Dictionary.

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(rĭ-frak′shŏn )

[L. refractio, a breaking back]

1. Deflection from a straight path, as of light rays as they pass through media of different densities; the change in direction of a ray when it passes from one medium to another of a different density.
2. Determination of the amount of ocular refractive errors and their correction.

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