refraction
A test to determine the refractive state of the eye, and the best corrective lenses required to aid in clear vision. A series of lenses in graded powers are offered to determine which provide sharpest, clearest vision.
Related Links
Refractive Errors and Refraction – How the Eye Sees
Refraction Test: Overview, Purpose & Procedure
Refraction: MedlinePlus Medical Encyclopedia
Facts About Refractive Errors — National Eye Institute
Refraction of eye — definition of refraction of eye by Medical dictionary
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