Overview
Related questions
Overview
Related questions
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Refraction
Refraction is the determination of a glasses prescription. Usually a phoropter is used, which the patient looks through at an illuminated screen. The examiner tries different lenses to determine the combination that gives the sharpest vision for each eye. Refraction can also be done using an autorefractor, but this is typically used as a starting point to be refined with the manual refraction.
How long it usually lasts:
Chronic (lasts years to lifelong)
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