Find the exact reading glasses power you need from your prescription — instant, free, no signup.
Enter your Sphere (SPH) and ADD values from your glasses prescription. Both are on your prescription slip from your optometrist.
| Power | Who it's for | Typical age |
|---|---|---|
| +1.00 | Very mild reading difficulty | 40–45 |
| +1.25 / +1.50 | Mild near vision loss | 45–50 |
| +1.75 / +2.00 | Moderate presbyopia | 50–55 |
| +2.25 / +2.50 | Stronger reading needs | 55–60 |
| +2.75 / +3.00 | Advanced presbyopia | 60–65 |
| +3.25 and above | Severe near vision loss | 65+ |
🎉 Know your reading glasses strength? Shop the best reading glasses online!
🛍️ Shop Reading Glasses by StrengthAll tools on PDCalculator.net are for educational and informational purposes only. They do not replace professional eye care advice, diagnosis, or treatment. Always consult a licensed optometrist or ophthalmologist before purchasing eyewear or making any changes to your vision correction. Results are based on standard optical formulas and are provided as a general guide only.
Reading glasses power is simply the sum of your distance prescription (SPH) and your ADD value. The ADD is the extra magnification your doctor prescribes for reading close-up text.
Sphere — your distance vision correction. Negative = nearsighted. Positive = farsighted. Zero means no distance correction needed.
Addition — extra magnification for close-up reading, usually between +1.00 and +3.50. Found on bifocal and progressive prescriptions.
Pharmacy reading glasses are one power for both eyes. If your eyes differ significantly, get custom prescription readers.
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