Refraction Test
Alternate Names : Eye Test - Refraction, Vision Test - Refraction
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How is the Test Performed?
This test is performed by an ophthalmologist or optometrist (eye doctor). You sit in a chair that has a special device (phoropter or refractor) attached to it and look through the phoropter at an eye chart approximately 20 feet away. The phoropter contains lenses of different strengths that can be moved into view.
The eye doctor will ask if the chart appears more or less clear with the lenses that are in place.
The eye doctor can determine if you have nearsightedness, farsightedness, astigmatism (asymmetrical cornea), or presbyopia (inability to focus on objects that are close to you). The extent of vision difficulty can be determined. The information obtained from a refraction test allows the prescription for eyeglasses or contact lenses to be correct for each person.
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