How Do Optometrists Determine Your Glasses Prescription? Optometrists determine your glasses prescription by measuring how your eye focuses light and then balancing that error with lenses until the image is sharply focused on the retina. They begin with an objective measurement using an autorefractor or retinoscopy, then fine tune it with a phoropter while you compare lenses (“Which is clearer, 1 or 2?”). Little math is needed during the exam; the optics are standardized and expressed in diopters, and most calculations are handled by the instruments and lens lab.

Ever wonder what all those lenses and “1 or 2?” actually do? We demystify your exam—from autorefractor to retinoscopy—and why astigmatism tweaks matter for crisp vision. #Astigmatism #Autorefractor #GlassesPrescription #Optometrist #Retinoscopy

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