what is a refraction eye exam

A refraction test is an eye exam that measures a person's prescription for eyeglasses or contact lenses. During the test, the patient sits in a chair and looks through a device called a phoroptor or refractor, focusing on an eye chart 20 feet away. The device contains lenses of different strengths that can be moved into the patient's view, and the eye doctor asks the patient if the chart appears more or less clear when different lenses are in place. The test is performed one eye at a time, and the results depend on the patient's responses. The test also involves shining specialized light into the patient's eyes to determine their refraction. The vision level achieved during the refraction test is called the best-corrected visual acuity (BCVA). Abnormal results may indicate conditions such as astigmatism, hyperopia, myopia, or presbyopia. A refraction test is usually given as part of a routine eye examination and is essential for prescribing corrective lenses. However, the charge for a refraction is only covered by some insurances, not all, and Medicare does not cover refractions because the test is considered to be part of a routine exam and not a medical need