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Autorefractor
Blogs
Autorefractor

Autorefractor

November 11, 2022
Young woman during an eye exam with the ophthalmologist
SerafinoMozzo / Getty Images

An autorefractor is a machine used to measure a person’s refractive error and prescription for eyeglasses or contact lenses. This is achieved by measuring how light is changed as it enters a person’s eye.

The automated refraction technique is quick, simple, and painless. The patient takes a seat and places their chin on a rest. One eye at a time, they look into the machine at a picture inside. The picture moves in and out of focus as the machine takes readings to determine when the image appears on the retina. Several readings are taken, which the machine averages to form a prescription.

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