How to Avoid Eye Strain While Using Modern Technology

Between the laptop at your desk, the phone on your commute and the tablet on the sofa, research from the College of Optometrists suggests many of us now clock up close to fifty hours of screen time a week. It's little wonder that tired, dry, achy eyes have become one of the most common complaints optometrists hear.

Here's the reassuring part first: digital eye strain is uncomfortable, but it's temporary. Screens themselves don't harm your eyes, the discomfort comes from how we use them. That means nearly all of it can be prevented with a few deliberate changes to your habits, your setup and, sometimes, your lenses.

Digital eye strain, sometimes called computer vision syndrome, is the collection of symptoms that builds up during sustained screen use. Sore or heavy eyes, a dry or gritty sensation, vision that goes soft when you glance up from the screen, headaches around the brow, or an aching neck and shoulders.

Symptoms typically creep in over the course of the day and fade after a decent break, which is one of the tell-tale signs that screens are the problem, rather than an underlying condition. If blurriness lingers even away from technology, it's worth reading our guide to the causes of blurred vision and booking an eye examination.

Three things are going on when you stare at a display for hours.

First, your eyes are locked at a single, fixed focusing distance, something they were never designed to sustain. The tiny ciliary muscles that adjust your focus stay contracted for as long as you keep reading, in the same way your arm would ache if you held a bag at one height all afternoon.

Second, concentration suppresses blinking. Each blink normally sweeps a fresh layer of tears across the surface of the eye; when blinks become fewer and shallower, that tear film evaporates and the eye's surface dries out, hence the gritty, burning feeling.

Third, screens are often fighting their environment, reflections from a window behind you, a display far brighter or dimmer than the room, text sized just small enough to make you squint. None of these damages your eyes, but each one adds effort, and effort is exactly what strain is.

The best-known remedy is the 20-20-20 rule, and it earns its reputation. Every 20 minutes, lift your eyes to something around 20 feet (roughly six metres) away and hold your gaze there for at least 20 seconds.

Distance viewing lets your focusing muscles release, and the pause naturally triggers a few full, slow blinks. Set a recurring timer if you tend to fall into deep-focus work. Most of us dramatically underestimate how long we've been staring.

Micro-breaks aren't a substitute for real ones, though. Aim to get up and away from the screen for five to ten minutes every hour: make a drink, stretch, look out of a window. Your eyes, back and concentration all benefit from the same habit.

A surprising amount of eye strain is really a setup problem. Run through this checklist at your desk:

• Distance, position the screen roughly an arm's length away (about 50 to 75cm). If you're leaning in to read, enlarge the text instead of closing the gap.
• Height, the top of the display should sit at or just beneath eye level, so you look slightly downward. This is also the position in which your eyelids naturally cover more of the eye, slowing tear evaporation.
• Glare, angle the screen away from windows and bright lights, or use blinds. If you can see a light source reflected in a switched-off screen, it's in the wrong place.
• Lighting, match your surroundings to your screen. A bright display in a dark room, or a dim one under harsh office lighting, forces constant adaptation.
• Laptops and phones, a laptop stand and separate keyboard transform a hunched setup, and holding your phone a little further from your face than instinct suggests eases the focusing load considerably.

Modern devices have accessibility settings that most people never open. Increase the default text size until reading feels easy and comfortable. Set brightness to adapt automatically, or adjust it to roughly match a sheet of white paper held next to the screen. Higher contrast between text and background reduces effort.

Keeping your screen clean, fingerprints scatter light more than you'd think, is the cheapest upgrade of all. Evening "night modes" that warm the display won't cure strain, but many people find them more restful for late reading, and dimmer warm light in the evening is kinder to your sleep as well as your eyes.

It sounds absurd to practise something you do thousands of times a day, but conscious blinking genuinely helps. When your eyes start to feel dry, close them fully for a couple of seconds, a deliberate, complete blink rather than the fluttery half-blinks screen focus produces.

If dryness persists, lubricating eye drops from a pharmacy can top up the tear film; ask the pharmacist for a preservative-free option if you use them often. Central heating and air conditioning both dry the air, so a little ventilation or a humidifier helps too. Persistent dry, sore eyes deserve a conversation with an optometrist rather than months of quiet tolerance.

Sometimes strain is your eyes telling you that they're compensating for something. Often a small uncorrected prescription that only shows itself under the sustained demand of screen work. If you're squinting, getting regular headaches or noticing the signs you may need glasses, an eye examination should be your first step.

The right lens choices make screen hours noticeably more comfortable. An anti-reflective coating cuts the reflections and ghosting that make displays harder work, particularly in bright offices and at night.

If you wear varifocals and find yourself tilting your head back to find the screen's "sweet spot", office lenses are designed precisely for desk distances.

As for blue light, the honest position is that the evidence linking blue light itself to eye strain is limited. Strain is overwhelmingly about focusing effort and blinking, though some people do find blue light lenses comfortable for long screen sessions.

Most digital eye strain resolves with better habits within days. But if symptoms carry on despite sensible breaks and a well arranged workstation. If you're getting frequent headaches, double vision, or blur that doesn't clear. Book an eye examination and describe your screen habits to the optometrist.

Strain that won't shift is frequently the first visible sign of a prescription change, and correcting it is usually straightforward. Our guide on how often you should have an eye test covers what to expect.

This article is for general information and isn't a substitute for professional advice. If you have concerns about your eyes or vision, speak to a registered optometrist or your GP.

The College of Optometrists, screen use and your eyes

Health and Safety Executive, working safely with display screen equipment

The College of Optometrists, clinical guidance on display screen equipment work

NHS England, eye health and NHS sight tests