What are the limitations of a diagnostic tool used to measure refractive errors like an autorefractor?

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Grade: Education Subject: Support
What are the limitations of a diagnostic tool used to measure refractive errors like an autorefractor?
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An autorefractor provides an objective measurement, but it's not always perfectly accurate. The results are a starting point. The eye care professional still needs to refine the measurement with a subjective refraction and consider individual patient factors.