Digital Eye Strain: What Helps, According to the Research

By the end of a long day at a screen, a lot of people have the same complaints: tired, dry or burning eyes, blur that comes and goes, a headache, a stiff neck. It has two names, computer vision syndrome and digital eye strain, and a long list of suggested fixes. Some of those fixes have reasonable evidence behind them. Some have almost none. This guide sorts them, and says how strong the evidence is for each.

It is general information, not medical advice. Symptoms that persist after the changes below, double vision, eye pain, or sudden changes in your sight are a reason to see an optometrist or ophthalmologist.

What digital eye strain is

The Tear Film and Ocular Surface Society (TFOS), in a 2023 report on screens and the eye, defines digital eye strain as recurring eye symptoms or signs that develop, or get worse, specifically with screen viewing. The American Optometric Association lists the usual ones: eyestrain, headaches, blurred vision, dry eyes, and neck and shoulder pain.

It is a description of symptoms, not a single disease. Several different things cause it, often at the same time, which is why no single fix works for everyone.

How common it is

Very, by most counts, though the numbers spread widely:

A 2023 meta-analysis of 45 studies (Anbesu and Lema) put the pooled prevalence at 66%, or nearly two in three screen users.
A larger 2024 meta-analysis (Ccami-Bernal and colleagues) pooled 103 studies and 66,577 people and found 69%, ranging from 12% to 97% across studies. Among university students it was 76%.

The spread is the warning. TFOS points out that there is no agreed definition and that the questionnaires used are weak, which is how one study finds 12% and another 97%. “Most regular screen users get some symptoms” is safe. Any single precise figure is not.

Why screens tire your eyes

You blink less, and less completely

People blink less when they concentrate on a screen. The American Academy of Ophthalmology puts normal blinking at about 15 times a minute and screen use at about 5 to 7. An early study by Patel and colleagues found an average five-fold drop during screen work. Fewer blinks means the tear film has longer to evaporate between them, which is where the dryness and burning come from.

The detail matters more than the headline. A small 2013 study (Portello and colleagues, 21 people) found that symptoms tracked the share of incomplete blinks, where the lid doesn’t fully close, and that making people blink more often with a tone did not reduce their symptoms. A 2018 review by Sheppard and Wolffsohn adds that newer studies find smaller drops than the old ones, and that mental effort lowers blink rate about as much as the screen does.

Your eyes work harder up close

Looking at something near takes two efforts: focusing (accommodation) and turning both eyes inward to meet at the same point (vergence). Holding both for hours is work, and problems with either add to symptoms, according to the Sheppard and Wolffsohn review. Vision that is fine at a distance can struggle at screen distance. The AOA notes that uncorrected farsightedness and astigmatism, and age-related changes such as presbyopia, the gradual loss of near focus, all contribute, and that glasses prescribed for general use may not suit computer work.

Glare, brightness and position

OSHA’s workstation guidance says excessive light or glare can cause eyestrain and headaches, and recommends arranging the room to cut glare from overhead lights, lamps and windows. A screen that is much brighter or dimmer than the room around it, reflections on a glossy panel, and a screen set too high or too close all add load.

What helps, and how good the evidence is

The best overall summary is a 2022 systematic review and meta-analysis in Ophthalmology (Singh and colleagues): 45 randomized trials, 4,497 participants. It did not find high-certainty evidence for any of the treatments it analyzed. So the advice below rests on a mix of small trials, consensus guidance and plain ergonomics, and we say which is which.

Correct your vision for screen distance

TFOS recommends full correction of refractive error for the distances you actually work at. This is consensus rather than a large trial, but it is the most direct fix for focusing strain. If you have started holding things further away to read them, or your glasses were made for driving or for reading a book at 40 cm, ask an optometrist about a prescription for your screen distance. The AAO describes computer glasses as set for about 20 to 26 inches, and notes they are not the same thing as blue-light-blocking glasses.

Take breaks, including the 20-20-20 rule

The AOA’s 20-20-20 rule says: every 20 minutes, look at something 20 feet (about 6 m) away for 20 seconds. The AAO gives the same advice. It is sensible and costs nothing. The numbers are a convention, though, not something a trial worked out, and the direct evidence is limited:

In a 2023 study of 29 people with symptoms, two weeks of webcam reminders to follow 20-20-20 reduced eye-strain and dry-eye symptoms. There was no control group, nothing changed in the tear film, and the improvement was gone one week after the reminders stopped.
In a 2007 field study of 51 data-entry workers, adding four 5-minute breaks a day to the usual two 15-minute breaks lowered discomfort and eyestrain, and output held up.

Fair summary: regular breaks probably help a little, the benefit lasts only as long as you keep taking them, and no exact schedule is proven better than another.

Set distance, height and text size

Guidance converges on about arm’s length, with the screen slightly below your eyes:

The AOA says 20 to 28 inches (about 50 to 70 cm) from the eyes, with the center of the screen 15 to 20 degrees below eye level. The same page elsewhere says 16 to 30 inches.
The AAO says about 25 inches.
OSHA says 20 to 40 inches (50 to 100 cm), and at least 20.

Then make text big enough to read comfortably from there. Small text pulls people toward the screen, which undoes the distance; this is ergonomic common sense rather than a tested intervention. If text is tiny on a high-resolution monitor, check the scaling with our resolution checker, which shows the resolution the system is drawing at and the scaling factor between CSS and physical pixels.

Match brightness to the room, and cut glare

The AAO advises setting screen brightness to match the light around you, raising contrast, and using a matte screen filter if glare is a problem. OSHA’s advice on glare is about the room: move the screen or the lamp so windows and lights don’t reflect in it, and avoid tilting the screen back toward ceiling lights. Our monitor calibration walks through setting black level, white level and gamma by eye, which helps you find a brightness and contrast that show detail without glare. This is low-cost guidance with little direct trial evidence.

Look after dry eyes

The AAO suggests artificial tears when your eyes feel dry, and a humidifier in a dry, warm room. Sheppard and Wolffsohn report that lubricating drops reduce symptoms, though they may not clear them completely, and TFOS calls for larger trials. Reasonable to try. Persistent dryness deserves an eye exam, because dry eye has causes other than screens.

What doesn’t have good evidence

Blue-light-filtering glasses

This is the most heavily marketed fix and the weakest. A 2023 Cochrane systematic review (Singh, Downie and colleagues) assessed 17 randomized trials. It concluded that blue-light-filtering lenses may not reduce eye strain from computer use compared with ordinary lenses over the short follow-up periods studied, and rated the evidence for visual fatigue as low certainty. The 2022 Ophthalmology meta-analysis also found that blue-blocking glasses did not reduce visual fatigue. The AAO says it does not recommend blue-light-blocking eyewear for computer use. Blue light also isn’t what drives the mechanisms above: blinking, focusing and glare work the same with a warm-tinted screen.

Supplements

The 2022 meta-analysis found berry extract did not reduce visual fatigue. Omega-3 supplements improved dry-eye symptoms in some trials, but the evidence was rated low certainty.

The fear of lasting damage

The AAO is clear that using screens does not permanently damage your eyes. The AOA says many of the symptoms are temporary and fade after you stop screen work, though they come back if the underlying cause, such as an uncorrected prescription, isn’t dealt with.

A short routine

Get an eye test that covers your screen distance, especially if your near vision has started to change.
Put the screen at about arm’s length, slightly below eye level, with no window or lamp reflecting in it.
Raise text size until you can read it without leaning in.
Match brightness to the room. A screen glowing in a dark room, or washed out in a bright one, both add strain.
Look away to something far off regularly, and blink fully when you do.
Use artificial tears if your eyes feel dry.

If you have done all of that and still get headaches at low brightness, especially on a phone, flicker is worth ruling out: screen flicker and PWM dimming shows how. For screens in the evening, see blue light, night mode and sleep.