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Why would an Autorefractor indicate 'error' for both eyes?

Updated: 8/16/2019
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16y ago

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An autorefractor can cometimes read "error" on patients with ripe cataracts or keratoconus. If a person is unable to keep their eyes still or they are sitting too close or too far away from the machine, you won't get a reading. Also, be sure to check that the machine is properly calibrated.

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Q: Why would an Autorefractor indicate 'error' for both eyes?
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