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. “If you have different prescription needs in each eye, astigmatism, high-power or more complex prescription needs, you should see an eye care professional for updated prescription eyewear.”
Reed seconds this, adding, “The wrong prescription can lead to headaches, eye strain or even nausea. If you do choose to buy online, we recommend selecting a lower power when deciding between two strengths, as this is generally a safer choice, and overly strong lenses tend to cause more
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