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Refraction  is the term used to describe the testing procedure used to determine what lens prescription a patient may need to see well. Light bends when it passes through lenses or prisms, and also when it passes through the surfaces of the eye. The first major surface that light passes through on its way to the retina is the  cornea . Astigmatism is one of the common refractive errors, along with  myopia  (nearsightedness) and  hyperopia  (farsightedne...Read More