This test is performed by an ophthalmologist or optometrist. Both of these professionals are often called an "eye doctors. You sit in a chair that has a special device (called a phoropter or refractor) attached to it. You look through the device and focus on an eye chart 20 feet (6 meters) 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 will then ask if the chart appears more or less clear when different lenses are in place. The results depend on your responses. Then, a device shines specialized light into your eyes and also determines your refraction. Responses from you are not needed. Each type of refraction have its own benefits. 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).
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