Prescription

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Reading the numbers

A full plain-language walkthrough of the prescription fields (sphere, cylinder, axis, ADD, PD), the 1978 US FTC Eyeglass Rule that requires the prescription to be handed over free of charge, and how to self-measure the spherical number with the centimeter method: What do the numbers on your eye prescription mean? There is also a companion video: what the numbers on your eye prescription mean (explained by Jake Steiner).

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