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Autorefractor
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<p>An autorefractor or automated refractor is a computer-controlled machine used during an <a href="/facts/Eye_examination/vcIUxDp8">eye examination</a> to provide an objective measurement of a person's <a href="/facts/Refraction_error/bcWcSg2N">refractive error</a> and <a href="/facts/Eyeglass_prescription/du1KHfLD">prescription</a> for <a href="/facts/Glasses/ER3sFKmJ">glasses</a> or <a href="/facts/Contact_lenses/0nzxq5Rm">contact lenses</a>. This is achieved by measuring how light is changed as it enters a person's eye. </p>