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Medical Health Encyclopedia
Refraction test
From Healthscout's partner site on alzheimer's disease, HealthCentral.com
The refraction test is an eye exam that measures a person's prescription for eyeglasses or contact lenses. Alternative Names
Eye test - refraction; Vision test - refraction; Refraction How the test is performed This test is performed by an ophthalmologist or optometrist. Both of these professionals are often called "eye doctor." You sit in a chair that has a special device (called a phoroptor or refractor) attached to it. You look through the device and focus on an eye chart 20 feet away. The device contains lenses of different strengths that can be moved into your view. The test is performed one eye at a time. ![]() The eye doctor performing the test will ask if the chart appears more or less clear when different lenses are in place. How to prepare for the test If you wear contact lenses, ask the doctor if you need to remove them before the test and for how long. How the test will feel There is no discomfort. Why the test is performed This test can be done as part of a routine eye exam. The purpose is to determine whether you have a refractive error (a need for glasses or contact lenses). For people over age 40 who have normal distance vision but difficulty with near vision, a refraction test can determine the right power of reading glasses.
Review Date: 02/10/2011 A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org). ![]() | |||||||||||||||||
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