Tired Eyes From Screens? The 20-20-20 Rule and How to Take Breaks
By late afternoon the text on your screen blurs, your eyes feel heavy, and dryness becomes hard to ignore. Most of the time the cause is that the muscles in your eyes stay locked on a close distance and that you blink less. This guide explains why screens tire your eyes, how to take breaks including the 20-20-20 rule, which screen settings to fix, and how to tell when you should see an eye doctor.
Three reasons screen work tires your eyes
“Tired eyes” is not just one thing. Once you separate out what's happening, the fix for each part becomes clear.
| Cause | What happens | Main fix |
|---|---|---|
| Focusing strain | While you keep looking at something close, the muscles inside your eye stay contracted | Look into the distance regularly to relax those muscles |
| Less blinking | When you concentrate you blink less, the tear film dries and the surface of the eye gets irritated | Blink on purpose and avoid dry environments |
| Screen and posture conditions | A screen that is too bright or too dark, glare, text that is too small, or a screen that is too close | Fix the settings and layout first |
People normally blink about 15–20 times a minute, but while concentrating on a screen this is said to drop to as little as a third of that. Blinking also drops while reading a book, but with a screen you look straight at a light source, your gaze tends to be higher and your eyes are opened wider, so they dry out more easily.
The 20-20-20 rule and how long to work without a break
A widely recommended way to relax muscles that have been focusing up close is the 20-20-20 rule: every 20 minutes, look at something 20 feet (about 6 meters) away for 20 seconds.
- Six meters is roughly the distance beyond which your eyes barely need to adjust focus. Looking out a window or at the far wall of the room is enough; there's no need to measure.
- You don't have to stare for the 20 seconds; letting your gaze wander is fine. Blinking deliberately at the same time also helps with dryness.
- The numbers are there to make it easy to remember, not because nothing else works. Turning it into a habit of “look into the distance at each break point” is easier to keep up.
For longer intervals, Japan's government guidelines for work with computers and other information devices are a useful reference: don't let a single stretch of continuous work exceed one hour, take a 10–15 minute pause between stretches, and take one or two short breaks within each stretch. The 20-20-20 rule corresponds to those short breaks.
| Interval | Guideline | What to do |
|---|---|---|
| Every 20 minutes | 20 seconds | Look at something about 6 meters away and blink deliberately |
| Every hour | 10–15 minutes | Step away from the screen; stand up and switch to a different task |
| Every half day | A few minutes | Warm your eyes and check the room's lighting and humidity |
Screen settings and placement
Before thinking about breaks, get the conditions right. If the settings are poor, your eyes will tire again soon even with breaks.
- Brightness: keep the difference between the room and the screen small. Put a sheet of white paper next to the screen; the right level is where the white of the paper and the white of the screen look about the same. A bright screen in a dark room creates a big contrast and adds strain.
- Distance: keep the screen at least about 40 cm from your eyes. The closer it is, the more your eyes have to work to focus. Phones in particular tend to creep closer, so hold yours with your arm a little extended.
- Height: place the screen so its top edge is at or slightly below eye level. Looking up means opening your eyes wider, which dries them out.
- Text size: if you lean in to read, the text is too small. Increase the zoom level first.
- Glare: windows or lights reflected in the screen force your eyes to keep adjusting. Turn the screen or move the light source.
- Dryness: avoid sitting where air conditioning blows directly at you. Use a humidifier, and choose eye drops by checking the ingredients.
Features that shift the screen toward warmer colors at night help reduce glare. But changing the color doesn't shorten your screen time, so use them together with breaks.
Ways to actually take your breaks
Even when you know about breaks every 20 minutes, they're hard to keep up. You need a system, not willpower, to make yourself stop.
- 1
Decide on break points by time
If you stop “once I reach a good stopping point,” it stretches on forever. Break by time, even in the middle of something. Working for 25 minutes and resting for 5 is longer than the 20-20-20 rule but easier to run.
- 2
Treat the timer sound as your signal to get up
The most common mistake is staying seated and looking at the screen while telling yourself you're on a break. Getting up and leaving your desk makes you look into the distance naturally. The Focus Timer includes a 20-minute + 20-second interval (the 20-20-20 rule) and a 25 + 5 minute interval, so you can make it a rule to stand up when it chimes.
- 3
Write down your daily screen time
Add up work, your phone while commuting and videos after you get home, and the total is usually longer than you'd guess. Turning your 24 hours into a chart shows where you can cut back.
- 4
Pick one block to cut
Cutting everything isn't realistic, so choose just one block that is easiest to reduce. Even dropping the 30 minutes before bed can change how your eyes feel the next morning.
- 5
Keep it up for a week and check the change
One day isn't enough to judge. Compare a week of records with how your eyes feel in the late afternoon. If nothing changes, suspect the conditions (brightness, distance, text size) instead.
Symptoms you shouldn't treat with eye drops and breaks alone
Everything so far assumes the kind of fatigue that goes away with rest. The following may not be caused by working conditions, so see an eye doctor.
- Your vision doesn't recover after rest, or things are hard to see as soon as you wake up
- Symptoms are only in one eye, or things look different when you cover each eye in turn
- Part of your field of vision is missing, or straight lines look wavy
- There's a sudden increase in spots of light or floaters that look like threads
- Eye pain comes with a headache or nausea
- Difficulty seeing has lasted several weeks or more, or doesn't improve with over-the-counter eye drops
Often the cause is glasses or contact lenses with the wrong prescription, and in that case more breaks won't help. If it's been a while since your last eye exam, it's worth getting your prescription checked. A summary of what is said about blue light and eye strain is in the effects of blue light.
FAQ
- What is the 20-20-20 rule?
- It's a way of taking breaks: every 20 minutes, look at something 20 feet (about 6 meters) away for 20 seconds. The goal is to relax the eye muscles that stay contracted while you look at things up close; 6 meters is roughly the distance beyond which your eyes barely need to adjust focus. There's no need to measure — looking out a window or at the other side of the room is enough.
- How bright should my screen be?
- The basic rule is to avoid a big difference from the brightness around you. Put a sheet of white paper next to the screen and adjust until the white of the paper and the white of the screen look about the same. A bright screen in a dark room creates a big contrast and adds strain, so either lower the brightness or add more room lighting.
- Do blue light glasses help with eye strain?
- Some people find that they reduce glare and feel more comfortable, but there is no settled view on whether they help with eye strain itself. What clearly helps is adjusting your distance from the screen, text size and brightness, and taking regular breaks to look into the distance. Sort out these conditions before considering glasses.
- What should I do if my vision stays blurry even after resting my eyes?
- If it doesn't recover with rest, affects only one eye, part of your vision is missing, lines look wavy, or it comes with a headache or nausea, the cause may not be your working conditions. See an eye doctor. Glasses or contacts with the wrong prescription are also a common cause, and more breaks won't fix that, so it's a good idea to have your prescription checked too.
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