How to Choose Reading Glasses Strength

To choose reading glasses strength, start with your eye-care professional’s near-vision advice and the distance at which you actually read. If ready-made readers are appropriate for you, a printed chart can suggest a strength to try. Check comfort with your usual tasks; an age table or chart cannot provide a prescription.

Here is a practical way to understand the numbers, use SunRay’s printable guide and check the available options without treating a stronger lens as a better lens.

What do reading glasses strength numbers mean?

Labels such as +1.00, +1.50 and +2.00 describe positive lens power, measured in diopters (D). A higher positive number means more positive optical power. It is not a quality rating, and +2.00 does not mean “twice life-size.” Cleveland Clinic explains diopters and prescription terminology.

For conventional ready-made single-vision readers, the label generally represents the same stated power in both lenses. It does not describe a personalised correction for each eye. Lens design is another question: a progressive reader has varying power across the lens, so check how its stated strength is defined.

Choose around the distance you actually read

Notice how you normally hold a book or phone and where your screen sits. Sit comfortably, then measure roughly from your eyes to the page or screen. Record your own distance rather than moving the task to match a number on a chart.

A strength that suits a nearby page may not suit a screen farther away. That does not mean everyone should buy a fixed lower power for computers. The American Optometric Association notes that an existing prescription may not suit a computer’s specific viewing distance. Describe both tasks when seeking advice.

Already wearing prescription glasses or contacts?

Begin with the advice you were given for near tasks. Tell your eye-care professional whether you read in your distance glasses, use contact lenses, or switch between pairs. These are different starting situations; do not copy a single number into a ready-made reader order.

SPH describes spherical correction; ADD describes additional near power within a prescription. Neither should automatically become your ready-made strength. Ask how the complete prescription relates to the task you want to do. If individual correction is needed, see our guide to reading glasses versus prescription glasses.

How to use SunRay’s printable reading glasses chart

The SunRay Lens Strength Guide covers +1.00 to +4.00 in 0.25-diopter steps. It is an indicative guide for trying ready-made readers, has not been clinically validated and cannot assess eye health.

1. Download the PDF from the guide page. Use the original file rather than a screenshot.
2. Print at actual size. Select US Letter and 100% / Actual size. Turn off “Fit to page.” Check the printed calibration line with a ruler: it must measure 1 inch (25.4 mm).
3. Prepare to read. Remove reading glasses. If you wear prescribed glasses or contacts, ask your eye-care professional about choosing readers.
4. Use the printed sheet in good light. Hold it 12–14 inches (30–36 cm) from your eyes, as specified by this chart.
5. Start at the smallest text. Continue down until an entire line is comfortably clear without squinting. Note the strength beside the first such line.
6. Treat that number as a starting point. If ready-made readers are suitable, try the indicated strength and check comfort at your usual reading distance.

Do not read this article’s pictures as a vision test. Screen size and zoom change the scale. If printing on A4, keep 100% / Actual size, check for clipping and verify the same calibration line. If no line is comfortably clear, do not automatically choose +4.00.

Why a reading glasses strength chart by age is not enough

Presbyopia is an age-related change in near focusing, but age alone cannot specify your correction. Other vision needs can occur alongside it. The National Eye Institute explains how presbyopia is checked during an eye exam.

Two people of the same age can have different prescriptions and daily tasks. Use age as background, not as a checkout rule. A birthday does not automatically mean it is time to increase the power.

What if reading still feels uncomfortable?

Check the setup before assuming you need stronger readers:

• Is the lighting adequate, without distracting glare?
• Are the lenses clean and the frame sitting comfortably?
• Are you checking the pair at your usual task distance?
• Does one task feel clear while another remains difficult?

Better lighting and larger text may help make reading easier, as the NEI describes. They do not replace needed correction. Persistent blur, recurring discomfort or a noticeable difference between eyes calls for professional assessment rather than repeatedly increasing strength. An eye exam can identify refractive errors.

Sudden new flashes, many floaters or a curtain-like shadow need urgent care; do not use a reading chart to investigate them. Read the NEI’s warning signs.

Why the chart and product options can differ

The chart’s 13 values are guide values, not a promise that every style offers every power. These SunRay options were checked on October 10, 2026:

Check the live options for your chosen style and colour; listed powers do not guarantee stock. If your suggested power falls between available options, ask for advice rather than automatically rounding up. A matching label alone also does not make different lens designs interchangeable.

Keep a short task note before choosing

Save four details to make your next conversation more useful:

• Task: book, phone, laptop, monitor or close hobby.
• Distance: your comfortable eyes-to-task measurement.
• Current correction: readers, prescription glasses, contacts or none.
• Experience: what feels clear, what does not, and when discomfort appears.

Bring these notes and any current prescription when seeking near-vision advice.

Frequently asked questions

Is +2.00 stronger than +1.00?

Yes, it has more positive lens power. That does not make it a better choice for your eyes or every reading task.

Can I choose reading strength from my age?

Age alone cannot determine a personal strength. Your correction needs and intended viewing distance also matter.

Should I use the same strength for books and computers?

Not necessarily. Check both at their usual distances and discuss the tasks together. There is no universal computer-strength conversion.

Can I use the chart on my phone instead of printing?

No. Phone size and zoom alter the physical scale. Use the original PDF at the specified print size.

Does the printable chart replace an eye exam?

No. It suggests a starting point for trying suitable ready-made readers, not a prescription or an eye-health result.