The 20-20-20 Rule: How to Give Your Eyes a Break From Screens
By the PomoTimer team. Last updated .
The 20-20-20 rule is a simple habit for screen users: every 20 minutes, look at something about 20 feet away for at least 20 seconds. It's recommended by the American Optometric Association as a way to ease digital eye strain, the tired, dry or achy eyes many people get after long stretches at a computer or phone. The rule is easy to understand; the hard part is remembering it, which is where a timer helps.
What the 20-20-20 rule means
Each number has a job:
| Number | What it means | Why it's there |
|---|---|---|
| Every 20 minutes | How often to take the break | Short enough to catch strain before it builds up |
| 20 feet away | How far to look | Far enough that your eyes stop working to focus up close |
| 20 seconds | How long to look | Long enough for your eyes to relax, short enough not to break your flow |
When you look at a screen a couple of feet away, the muscles inside your eye work to keep it in focus. Looking into the distance lets them relax. People also tend to blink less while concentrating on a screen, so a short pause is a good moment to blink fully a few times.
Twenty feet doesn't need to be exact. A window, the far end of a hallway or the other side of an open office all work. If your desk faces a wall, stand up and look across the room.
Digital eye strain: what the rule helps with
Digital eye strain (sometimes called computer vision syndrome) is the name eye-care professionals use for a group of symptoms that show up after prolonged screen use. Common ones include:
- Tired or sore eyes
- Dry, burning or watery eyes
- Blurred vision after looking up from the screen
- Headaches
- Neck and shoulder aches from holding one posture
The 20-20-20 rule is one piece of the picture, not a cure-all. It won't correct an outdated glasses prescription or fix a screen that's badly placed. If symptoms keep coming back or get worse, book an eye exam with an optometrist or ophthalmologist; you may need glasses for computer distance, or there may be another cause worth checking.
How to actually remember it
Almost everyone agrees the rule makes sense. Very few people follow it for a whole afternoon, because 20 minutes disappears when you're focused. A few ways to make it stick:
- Use a repeating timer instead of willpower. A sound every 20 minutes does the remembering for you (setup below).
- Tie it to something you already do. Look out the window every time you send an email, finish a slide or wait for a file to load.
- Pick your far point in advance. Decide on one spot, like a tree outside or a clock on the far wall, so you don't waste the break deciding where to look.
- Count the seconds or use a 20-second timer. Twenty seconds feels longer than it is, and most people stop at five.
- Stack it with a stretch. While you're looking away, roll your shoulders and sit back. Your neck benefits as much as your eyes.
How to time the 20-20-20 rule with PomoTimer
Choose whichever setup fits how you work:
- Fully automatic: open the interval timer and set work to 20 minutes (1,200 seconds), rest to 20 seconds and rounds to 12. That covers roughly four hours. The timer beeps when each phase changes, so you hear one signal to look away and another to get back to work, without touching anything.
- One break at a time: start the 20 minute timer. When it rings, look away and run the 20 second timer (or just count slowly), then restart the 20 minutes.
- Inside a Pomodoro: if you already work in 25-minute blocks with the Pomodoro timer, use each 5-minute break to look far away and add one quick look-away near the middle of each block. Our guide to the Pomodoro Technique explains the full cycle.
For longer pauses, the break timer has a "Suggest a break activity" button that includes the 20-20-20 eye break among its ideas. Whatever you use, keep the tab open: the alarms only sound while the page is open, and you can pick a gentle sound like Bell or Correct so it doesn't startle you every 20 minutes.
Other screen habits that help your eyes
The rule works best alongside a comfortable setup. These are general ergonomics tips that are easy to try:
- Position the screen about an arm's length away, with the top of the screen at or slightly below eye level, so you look a little downward.
- Cut glare. Avoid a bright window directly behind or in front of the screen, and tilt the monitor to reduce reflections.
- Match brightness to the room. A screen much brighter or darker than its surroundings is harder to look at for long.
- Make text bigger. If you lean in to read, zoom in instead.
- Take longer breaks too. The 20-second look-away doesn't replace getting up every hour or so to move around.
Frequently asked questions
Does the 20-20-20 rule work for phones and tablets too?
Yes. Phones are usually held even closer than computer screens, so your eyes focus hard the whole time. The same rule applies: every 20 minutes, look up and into the distance for 20 seconds.
What if I can't see anything 20 feet away?
Look at the farthest point you can, such as across the room or out a window. The goal is to give your eyes a break from close-up focus; a few feet short of 20 is still far better than staying on the screen. Closing your eyes for 20 seconds is another option if there's no distance to look at.
Is the 20-20-20 rule good for kids?
It's an easy habit for kids doing homework or reading on a tablet, and a timer makes it a game rather than a nag. If a child often complains of headaches, eye pain or blurry vision, have their eyes checked by an eye doctor.
Can I take a longer break instead of every 20 minutes?
Longer breaks are good, but they work differently. The point of the 20-20-20 rule is frequent, short rests before strain builds up, so it pairs well with longer breaks rather than replacing them.