Reading glasses are labelled with a strength in "diopters", such as +1.00, +1.50 or +2.50. The higher the number, the stronger the magnification. Choosing the right one makes the difference between comfortable reading and tired eyes.
A typical guide by age
| Age | Common starting strength |
|---|---|
| 40–44 | +0.75 to +1.00 |
| 45–49 | +1.00 to +1.50 |
| 50–54 | +1.50 to +2.00 |
| 55–59 | +2.00 to +2.25 |
| 60+ | +2.25 to +3.00 |
This is only a general guide — everyone's eyes are different.
A simple at-home check
- Hold a book or phone at your normal reading distance (about 14–16 inches).
- Note the smallest text you can read comfortably for a minute without strain.
- If you have to hold things farther away to read them, you probably need a stronger lens. If text looks clear only very close to your face, the lens may be too strong.
Already own readers?
If your current readers feel comfortable, choose the same strength. If you've been using them for a few years and find yourself holding books farther away, try one step (+0.25 to +0.50) stronger.
When to get an eye exam instead
- Your two eyes seem to need different strengths
- You have frequent headaches or double vision
- You notice sudden blurring, flashes, floaters or loss of vision
- You haven't had an eye exam in two years or more
Regular eye exams check eye health, not just vision, so they're worth doing even if readers work well for you.
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