Strength
Reading glasses typically range from +0.25 to +2.50 diopters (the unit of measurement for eye prescriptions), though the average starting strength is usually around +0.75. In rare cases, reading glass strength can go up to +4.00.
“Tips for buying reading glasses online are similar to buying ready-made reading glasses at the drugstore: It’s a convenient option but it’s not a good idea for everyone,” says Dr. Ravi Goel, clinical spokesperson for the American Academy of Ophthalmology….

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