This is a slide show presentation I prepared for the Technical Support staff at Topcon Medical Systems to introduce and familiarize the art of refraction.
2. Refraction In ophthalmology and optometry, refraction (also known as refractometry ) is a clinical test in which a phoropter is used to determine the eye's refractive error and the best corrective lenses to be prescribed. A series of test lenses in graded optical powers or focal lengths are presented to determine which provide the sharpest, clearest vision.