Why do I get headaches or blurred vision after using screens?

You finish a long day on your laptop and notice that the words have started to blur. Your eyes feel heavy or gritty, and a dull headache has developed across your forehead or behind your eyes. When you finally look away from the screen, it may take a moment for your distance vision to feel clear again.

These symptoms are often linked to digital eye strain, sometimes called computer vision syndrome. The discomfort can be frustrating, but it is usually temporary. There is no reliable evidence that working with digital displays causes permanent damage to your eyes, although prolonged screen use can make an existing vision problem more noticeable.

Why do my eyes struggle after long periods of close work?

Your eyes constantly adjust their focus depending on how far away you are looking. When you use a phone, tablet or computer, the focusing system inside each eye remains active so that text and images stay clear. Your eyes must also turn slightly inwards so that they continue working together at close range.

Holding this focus for a long time can become tiring, particularly if you do not look away or change viewing distance. This may cause:

• an ache around the eyes or forehead
• temporary blurred vision
• difficulty refocusing when you look into the distance
• tired or heavy eyes
• sensitivity to bright light
• discomfort in the neck or shoulders

The screen itself is not always the whole problem. Small text, glare, poor contrast, an awkward viewing angle and sitting too close can all increase the effort involved.

Headaches during screen use may also be related to posture, muscle tension, stress or migraine. It is therefore worth looking at the complete pattern rather than assuming that every headache begins in the eyes.

Why do my eyes become dry, gritty or watery?

People tend to blink less often and less completely when concentrating on a screen. Each full blink spreads a fresh layer of tears across the front of the eye. When you blink less, those tears evaporate more quickly and the surface can become dry and irritated.

Dry eyes can feel:

• gritty, scratchy or sore
• itchy or burning
• tired and uncomfortable
• temporarily blurred
• sensitive to light
• unusually watery

Watery eyes may seem surprising, but excess watering can be the eye’s response to an irritated or unstable tear surface.

Air conditioning, central heating, low humidity and direct airflow from a fan can make dryness worse. Contact lenses may also become less comfortable towards the end of a screen-heavy day.

Blur caused by dryness may clear briefly when you blink because the tear layer has been spread more evenly across the eye again.

Could my eyesight be contributing to the problem?

Screen use can reveal a vision problem that was previously mild enough to go unnoticed.

Short-sightedness, long-sightedness and astigmatism can all contribute to headaches, blurred vision or eye strain. Even a small change in your prescription may matter when you spend several hours concentrating at one distance. Astigmatism, for example, can cause blurred vision, headaches and eye strain after prolonged concentration.

Your symptoms may also be worse if:

• you are not wearing glasses that have been prescribed for close work
• your current glasses are no longer giving you clear vision
• your eyes do not coordinate comfortably at close distances
• you have an underlying dry eye or eyelid condition
• you wear contact lenses for long periods
• you are developing age-related difficulty focusing up close

From around the age of 40, the natural lens inside the eye gradually becomes less flexible. This is called presbyopia. You may notice that you need to hold text further away, increase the font size or use brighter lighting. Screen use does not cause this change, but it can make the symptoms more obvious.

How can I reduce screen-related headaches and blurred vision?

You may not be able to avoid screens, particularly if you use them for work or study. Small changes to how you use them can still make a noticeable difference.

A useful reminder is the 20-20-20 rule. Every 20 minutes, look at something around 20 feet away for at least 20 seconds. Looking into the distance allows the focusing system to relax, while the pause also reminds you to blink. UK eye-care organisations commonly recommend this approach to help reduce tired eyes and headaches.

It can also help to:

• take longer breaks away from the screen throughout the day
• blink fully and regularly
• increase the text size rather than leaning forwards
• place your monitor roughly an arm’s length away
• position the top of the screen at or slightly below eye level
• reduce glare from windows and overhead lighting
• adjust the screen brightness so that it is comfortable in the room
• avoid working with a bright screen in an otherwise dark room
• keep fans and air-conditioning vents from blowing directly towards your eyes
• wear your prescribed glasses when using a screen

Lubricating eye drops may help if dryness is contributing to your symptoms. A pharmacist or optometrist can advise which type is suitable, particularly if you wear contact lenses or need to use drops regularly.

Blue-light filtering glasses are heavily marketed for screen use, but current evidence does not show that they reduce digital eye strain more effectively than ordinary lenses. Correcting your prescription, taking breaks and improving your screen set-up are more likely to help.

When should I arrange an eye examination?

Book an eye examination with an optometrist if headaches, blurred vision or discomfort keep returning despite regular breaks and changes to your workspace.

You should also arrange a check if:

• your vision remains blurred after you stop using the screen
• you are struggling to change focus between near and distant objects
• one eye seems clearer than the other
• you need to move closer to the screen or enlarge text more than before
• your glasses or contact lenses no longer feel right
• dry, red or painful eyes keep returning
• headaches are becoming more frequent
• the symptoms interfere with work, reading or driving

An optometrist can check your prescription, how well your eyes focus and work together, and whether dry eye or another condition is contributing. They can refer you to an ophthalmologist or another healthcare professional if they find something that needs further investigation.

See a GP if your headaches continue even when you are not using screens, become more severe or are accompanied by other symptoms. Screen use may aggravate a headache disorder without being its underlying cause.

Which symptoms should never be blamed on screen use?

Digital eye strain tends to develop gradually during close work and improve when you rest your eyes. It should not cause sudden sight loss, a missing area of vision or severe eye pain.

Contact NHS 111 or seek urgent eye-care advice if you develop:

• sudden blurred or reduced vision
• new flashes of light
• a sudden appearance or increase in floaters
• a dark shadow or curtain moving across your vision
• sudden loss of part of your visual field
• significant eye pain, especially with redness or reduced vision
• a sudden change affecting one eye

Flashes, new floaters, a curtain-like shadow and sudden blurred vision can be symptoms of a retinal tear or retinal detachment, which needs prompt assessment to protect your sight.

Call 999 if a sudden visual change or severe headache is accompanied by weakness or numbness on one side, facial drooping, difficulty speaking, confusion, collapse or another possible sign of a stroke.

For most people, tired eyes, mild headaches and temporary blurring after screen use improve with breaks, better positioning and treatment for dryness or an outdated prescription. The important distinction is whether the symptoms follow a predictable pattern and settle with rest.

A screen-heavy day can leave your eyes uncomfortable. It should not cause a sudden or persistent loss of vision. When the pattern changes or something does not feel right, an eye examination is the safest next step.

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Medically Reviewed
Last reviewed on 11/07/2026