Choosing reading glasses online is relatively simple once you understand what the strength numbers mean.
You’ll usually see numbers such as +0.50, +1.00, +1.50, +2.00,+2.50 or +3.00. But the highest number isn’t necessarily better, and age alone can’t tell you exactly which strength you need.
The aim is simple: find the lowest magnification that makes close-up text clear and comfortable at your normal reading distance.
Here’s how.
What Do Reading Glasses Strength Numbers Mean?
Reading glasses strength is measured in dioptres (D).
For example:
- +1.00
- +1.50
- +2.00
- +2.50
- +3.00
The higher the number, the greater the magnification.
So +2.00 is stronger than +1.50.
That doesn’t mean +2.00 is “better”. You want the strength that works comfortably for you rather than simply choosing the strongest pair available.
Don't Choose Reading Glasses by Age Alone
You’ll find plenty of reading-glasses age charts online.
They can provide a rough reference, but they shouldn’t be treated as a prescription.
Two people of exactly the same age can prefer different strengths because comfortable magnification can be affected by their existing vision and the distance at which they're trying to see clearly.
Your normal reading distance is particularly important.
Someone reading a paperback at close range may prefer a different strength from someone looking at a laptop positioned considerably farther away.
Use age as context - not as the answer.
How to Choose Your Reading Glasses Strength
1. Start at Your Normal Reading Distance
Don't change the way you naturally hold a book or phone just to make a particular pair of readers work.
Sit comfortably and hold your reading material where you normally would.
Then compare strengths at that distance.
2. Start Lower
If you're comparing two strengths and both seem reasonably clear, start with the lower magnification.
Stronger isn't automatically better.
The goal is enough magnification to make close-up text clear without unnecessarily increasing the strength.
3. Use Real Reading Material
Don't test your readers using one enormous line of text.
Try the things you actually read every day:
- A book
- Your phone
- A restaurant menu
- Product packaging
- A newspaper or magazine
The right strength should make ordinary close-up text comfortably readable.
4. Compare Strengths
If you have access to several strengths, compare them at the same reading distance.
Move up gradually rather than jumping straight to a much stronger pair.
You're looking for the lowest strength that gives you comfortable clarity.
5. Don't Force the Reading Distance
Pay attention to what you're doing with the page.
If you have to move your book dramatically closer or farther away to make the text clear, try another strength.
Your readers should work with the way you naturally read—not force you into an awkward position.
Reading Glasses for Books vs Computers
This is where choosing reading glasses can become confusing.
A book or phone is generally held closer to your eyes than a desktop computer screen.
Because reading-glasses strength and working distance are connected, the strength you like for a novel may not necessarily be the strength you prefer at your computer.
If computer use is your main concern, read our Reading Glasses for Computer Use guide.
Can You Use the Same Strength for Everything?
Possibly.
If most of your close-up tasks happen at similar distances, one strength may work perfectly well for your everyday needs.
But your readers don't necessarily need to perform every job.
You might use one pair primarily for books and menus and have another pair where you work.
And if your biggest problem is simply never having your glasses when you need them, our guide to how many pairs of reading glasses you really need may help.
Ready-Made Reading Glasses Aren't Right for Everyone
Ready-made—or over-the-counter—reading glasses provide the same magnification in both lenses.
They're designed as a simple option for close-up tasks.
They aren't a substitute for individually prescribed lenses when someone has more complex vision requirements.
Consider seeing an optometrist if:
- Your vision is noticeably different between your two eyes
- You have persistent blur despite trying appropriate magnification
- You experience double vision
- You have eye pain
- Your vision changes suddenly
- You're unsure whether ready-made readers are appropriate for you
Regular eye examinations are also important regardless of whether you wear ready-made reading glasses.
What's the Strongest Reading Glasses Strength?
Ready-made readers are available in a range of strengths, although the exact range varies between brands.
Ministry of Sight currently offers strengths from +0.50 to +3.00.
Again, don't choose +3.00 simply because it's the strongest.
More magnification isn't automatically better magnification.
Choose the strength that makes your normal close-up tasks comfortably clear.
If you feel you need more magnification than the strengths available to you, an optometrist can assess your individual requirements.
Do Reading Glasses Make Your Eyes Weaker?
No.
Reading glasses provide magnification for close-up tasks. Wearing them doesn't make your eyes “lazy” or cause you to become dependent on them.
It is normal for near focusing ability to change with age, which is why someone may find that the strength they prefer changes over time.
What If You're Between Two Strengths?
Compare them using the same text, lighting and reading distance.
If both provide clear vision, start with the lower strength and see whether it comfortably does what you need it to do.
You don't need to buy more magnification simply because it's available.
Strength Isn't the Only Thing That Matters
Once you've found suitable magnification, look at the glasses themselves.
A pair you reach for every day should also be comfortable, well made and easy to wear.
Consider:
- Frame dimensions
- Overall fit
- Frame material
- Hinge construction
- Lens features
- Weight and balance
- Returns policy
If you're comparing different pairs, our How to Check Glasses Quality guide explains what to look for.
Choosing Reading Glasses Online
Before ordering, check three things:
Strength: Do you know which magnification works comfortably for you?
Fit: Have you checked the frame measurements?
Returns: Can you easily return or exchange the glasses if they're not right?
For more help with fit, see our Reading Glasses Fit Guide.
Ministry of Sight Reading Glasses
Ministry of Sight is an Australian ready-made reading-glasses brand.
Our readers feature:
- Premium acetate frames
- Blue-light filtering lenses
- Anti-glare lenses
- Scratch-resistant lenses
- Strengths from +0.50 to +3.00
- Protective case
- Microfibre cleaning cloth
- Easy 30-day returns
They're designed for people who need magnification but don't want their reading glasses to look like an afterthought.
Frequently Asked Questions
What strength reading glasses do I need?
There isn't one strength that's correct for everyone of a particular age. Compare strengths at your normal reading distance and look for the lowest magnification that makes close-up text comfortably clear.
Does a higher number mean stronger reading glasses?
Yes. +2.00 provides more magnification than +1.50, for example. Higher doesn't automatically mean better.
Should I choose reading glasses based on my age?
Age can provide context, but it shouldn't be used as a personalised prescription. People of the same age can prefer different strengths.
Should I choose the stronger pair if I'm between strengths?
Not automatically. If both make your reading material clear at your normal distance, start with the lower strength.
Can I use reading glasses for my computer?
It depends on your working distance. Computer screens are generally farther away than books or phones, so the strength you prefer for close reading may not be ideal for your computer.
When should I see an optometrist?
Seek professional advice if you're unsure whether ready-made readers are suitable, your two eyes appear to require substantially different correction, you have persistent blur, double vision, eye pain or a sudden change in vision.
The Simple Rule
Don't guess from your age and don't assume stronger is better.
Test at your normal reading distance and choose the lowest strength that gives you comfortable, clear close-up vision.
That is a much more useful starting point than any age chart.
