Blue-Light Glasses and Eye Strain Evidence

Long screen days can leave eyes tired.

Blue-light filtering glasses are often sold as the fix. A Cochrane review of 17 trials found they may make no short-term difference to eye strain from computer work. UK workplace guidance points to simpler things: breaks, a well set-up screen and an eye test.

Updated 16 October 2026 · 6 sources

Break little and often
Set the screen up well
Get your eyes tested
Plain habits, rested eyes

Check your screen day

THE SHORT ANSWER

The filter is
not the fix.

The best trials so far found little benefit.
Guidance focuses on how you work instead.

THE GLASSES

Little difference found

A 2023 Cochrane review of 17 trials and 619 people found blue-light filtering lenses may not reduce short-term eye strain from computer use.

See the numbers

BREAKS

Little and often

HSE says short, frequent breaks are better than long, rare ones: 5 to 10 minutes every hour beats 20 minutes every 2 hours.

Habits to try

EYE TESTS

Ask at work

If you use a screen daily for an hour or more at a time, your employer must pay for an eye test if you ask for one.

Check your screen day

General information only, not medical advice. For advice about your own health, speak to a doctor, pharmacist or other qualified health professional.

A person seen from behind standing up from a desk and stretching while looking out of a window at trees — AI-generated image, not a photograph of a real person or place.

FOUR HABITS TO TRY

Easier on the eyes,
without new kit.

HSE suggests a few simple steps for screen users. None of them needs special lenses.

Position the screen
Check the screen is well positioned and properly adjusted, as HSE advises for tired eyes.
Sort the lighting
Make sure lighting suits the work, so the screen is not fighting glare or a dim room.
Break little and often
Stand up, move or stretch for a few minutes every hour rather than one long break later.
Book an eye test
The NHS recommends a test every 2 years. If you are a DSE user, ask your employer to pay.

TWO NUMBERS WORTH KNOWING

What the trials
and the guidance say.

One figure on the size of the evidence,
one on how often to break from the screen.

17 trials

Randomised trials of blue-light lenses reviewed

The review pooled 17 trials with 619 people in six countries. It found blue-light filtering lenses may give no short-term advantage for visual fatigue with computer use.

COCHRANE REVIEW · 2023

5–10 min an hour

A better pattern of screen breaks

HSE says 5 to 10 minutes every hour is better than 20 minutes every 2 hours, and that ideally users should be able to choose when to take breaks.

BREAKS · HSE

The Cochrane authors searched for studies up to 22 March 2022. They found the effects on sleep unclear and said no study had measured macular health, so better trials are still needed.

A QUICK SCREEN-DAY CHECK

What does your
screen day look like?

Pick the situation closest to yours to see what HSE and NHS guidance says. The bar shows how much the guidance asks of you or your employer.

Based on HSE guidance on display screen equipment and NHS advice on eye tests. This is general information, not personal medical or legal advice.

Screen-day check

Choose a situationA few short spells a dayAn hour or more at a time, dailyWorking at home on a laptopLong stretches with no changeNeed glasses just for the screen

A few short spells a dayUsual eye tests

The DSE regulations do not apply to people who use screens infrequently or only for a short time. The NHS recommends an eye test every 2 years.

An hour or more at a time, dailyYou are a DSE user

HSE calls you a DSE user. Your employer must assess your workstation, plan breaks or changes of activity, and pay for an eye test if you ask.

Working at home on a laptopSame rules apply

HSE says the DSE law applies to home workers, mobile workers and hot-deskers as well as people at a fixed desk.

Long stretches with no changePlan breaks

If a job has no natural changes of activity, HSE says employers should plan rest breaks that let you get up, move around or at least stretch.

Need glasses just for the screenEmployer pays

If the test shows you need glasses prescribed for screen distance, the employer pays. If an ordinary prescription works, they do not have to.

Sources: HSE, Working safely with display screen equipment (overview, breaks, eyes and eyesight testing); NHS, Visiting an optician.

Two hands holding a pair of plain clear-lensed glasses in front of a softly blurred computer screen — AI-generated image, not a photograph of a real person or place.

SCREENS AND YOUR EYES

Tired, but
not damaged.

HSE says screen work does not cause permanent damage to the eyes. Long spells of it can bring tired eyes, discomfort, temporary short-sightedness and headaches.

Because screen work is visually demanding, it can make people notice eyesight problems they had not spotted before, including changes that come with age. That is one reason an eye test is worth having.

In conversation

Questions people ask

Do blue-light glasses stop eye strain?

The best evidence so far says probably not in the short term. A 2023 Cochrane review of 17 trials found blue-light filtering lenses may not reduce eye strain from computer use compared with ordinary lenses.

Do they help with sleep?

The Cochrane review found the effects on sleep unclear and the evidence inconclusive. The College of Optometrists says there is no strong evidence they improve sleep quality.

Can screens damage my eyes?

HSE says display screen work does not cause permanent damage to eyes, but long spells can lead to tired eyes, discomfort, temporary short-sightedness and headaches.

Will my employer pay for an eye test?

If you use a screen daily for continuous periods of an hour or more, HSE says your employer must provide and pay for an eye test if you ask, and pay for glasses only if you need them just for screen work.

How often should I take a screen break?

There is no legal rule on length. HSE says short, frequent breaks are better, for example 5 to 10 minutes every hour rather than 20 minutes every 2 hours.

Sources

Each figure on this page comes from the sources below.

Rest the eyes,
not the lens.