Reading glasses strength by age: a starting chart
Why close-up vision fades in your forties, the usual over-the-counter strength for each age, how to adjust for screens, and when readers are the wrong answer.
Updated October 1, 2026
Why reading gets harder in your forties
The lens inside the eye stiffens with age, and the muscle that changes its shape to focus close up has less to work with. The condition is called presbyopia, and it is universal: it starts for most people between the early and mid forties, and it keeps progressing into the sixties before it levels off. The first sign is holding a menu further away, or needing more light to read a label.
Reading glasses are a plus lens that does the focusing the eye no longer does. The strength is written in diopters, with a plus sign, in steps of 0.25.
The chart
These are the common over-the-counter starting points. They assume you see well at a distance without glasses.
| Age | Typical starting strength |
|---|---|
| 40 to 44 | +0.75 to +1.00 |
| 45 to 49 | +1.00 to +1.50 |
| 50 to 54 | +1.50 to +2.00 |
| 55 to 59 | +2.00 to +2.25 |
| 60 and over | +2.25 to +2.75 |
Two things shift you within a range. Small print and poor light push you toward the top of it. If you already find yourself holding things far away, start at the top; if the problem is new, start at the bottom.
Adjusting for distance
The chart is for reading distance, roughly 30 to 40 cm. A computer screen sits further away, and the further the object, the less plus power you need. A common rule is to take about half a diopter off your reading strength for a screen at 60 to 70 cm. Many people end up with two pairs: a reading pair for print and phones, and a weaker pair for the desk.
The strength finder on this site applies exactly that adjustment, and adds a quick on-screen check so the result reflects your eyes rather than only your age.
When readers are the wrong answer
Over-the-counter readers have the same strength in both lenses, no astigmatism correction, and a fixed distance between the lens centers. They are the wrong tool if:
- you already wear distance glasses or contacts. You need a bifocal, progressive, or a reading prescription that accounts for the distance correction.
- your eyes are noticeably different. One blurry eye with readers on means the strengths should differ, which only a prescription can do.
- you have headaches, double vision, or a sudden change. Those are reasons for an eye exam, not a stronger reader.
Buying
Readers are cheap enough to buy two strengths and keep the one that works. Multi-packs make that easy. The comparison on the hub prices the cheapest full-frame reader at +2.00 at each retailer so you can see what a single pair costs shipped, and the strength finder links straight to each retailer’s readers.
Questions people ask
Should I start with a weaker or a stronger pair?
Weaker. The lowest strength that makes print comfortable is the right one. A pair that is too strong feels sharp at first and tires your eyes within an hour.
Can I wear readers all day?
They only correct near vision, so walking around in them blurs everything past arm's length. People who need a pair they can leave on usually end up with progressives.
Do cheap readers hurt your eyes?
No. A reader is a simple plus lens. The usual complaints, headaches and eye strain, come from the wrong strength, from the lenses being off-center for your pupils, or from needing a prescription rather than a reader.
Why do my eyes feel worse after I started wearing readers?
Presbyopia keeps progressing with age whether or not you wear readers. The glasses make the change noticeable because you now have something to compare against.