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OPAn auto-refractometer is a device used in eye care to measure the refractive error of the eye automatically. In simpler terms, it helps determine whether a person is nearsighted (myopia), farsighted (hyperopia), or has astigmatism, which is needed to prescribe glasses or contact lenses.
Here’s a bit more detail:
• The patient looks into the machine at a target (usually a small picture or light).
• The device shines light into the eye and measures how it bends (refracts) inside the eye.
• Based on this, it calculates the eye’s lens power needed for correct focus.
• It’s quick, non-invasive, and usually accurate, but the results are often refined with a manual refraction test by an eye doctor (optometrist or ophthalmologist).
Basically, think of it as a fast “starter” measurement to see what kind of glasses or contact lenses someone might need.
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