Eye break reminder on a Mac: how to set one for 20-20-20

To get an eye break reminder on a Mac, set a repeating timer or reminder that tells you to look about 20 feet away for 20 seconds. macOS has no eye break setting of its own, so you build one from the Clock app, Reminders or Shortcuts, or use an app that counts your time at the screen and spaces the breaks for you.

The harder part is the rhythm. The 20-20-20 rule asks for a break every 20 minutes, and very few people keep that up for more than a few days. This post covers the built-in ways to set a reminder, why the strict interval tends to fail, and a gentler approach that still gets your eyes off the screen several times a day.

What an eye break is for

When you look at something close, a ring of muscle inside each eye tightens to keep it in focus, and your eyes turn slightly inward. Hold that for hours and they get tired. People also blink less while they concentrate on a screen, so the surface of the eye dries out. Looking at something far away lets the focusing muscle relax, and with nothing to read you tend to blink normally again.

That is the whole idea behind the 20-20-20 rule: every 20 minutes, look at something about 20 feet (six meters) away for 20 seconds. It shows up in advice from the American Academy of Ophthalmology, among others. The 20-20-20 rule covers where it comes from and what it can and can't do.

Eye breaks ease the discomfort of a long screen day. They are not a treatment. Headaches that keep coming back, blurred or double vision, or eye pain are reasons to see an optometrist or a doctor, and an out-of-date glasses prescription is a common cause of screen days that feel harder than they should.

Does macOS have an eye break reminder?

No. There is no setting in macOS that reminds you to rest your eyes, and the features you might expect to do it don't:

• Screen Time on the Mac (System Settings > Screen Time) can schedule Downtime and set limits on apps. Those are about how much you use the Mac, not about short breaks during the day.
• Screen Distance, the Screen Time feature that warns you when a device is held too close to your face, is on iPhone and iPad, not the Mac.
• Night Shift and True Tone change the color of the screen. They don't remind you to look away.

So an eye break reminder on a Mac means building one from Apple's general-purpose apps, or using an app made for it.

How to set an eye break reminder with built-in apps

With a Clock app timer

Clock, in the Applications folder on macOS Ventura and later, is the closest built-in match to the 20-20-20 interval.

1. Open Clock and go to Timers.
2. Make a 20 minute timer and give it a label, such as "Look away".
3. Start it. When it goes off, look out of a window or across the room for 20 seconds.
4. Start it again. Recent timers stay in the list, so after the first time it is a single click.

Good at: exact timing. Weak at: keeping going. The timer doesn't restart itself, so the habit lasts exactly as long as you remember to press start.

With Reminders

Make a reminder called "Rest your eyes", give it a start time in its details (the "i" button), and choose Hourly from the Repeat menu, which recent versions of macOS offer. An hourly reminder is a third of what the strict rule asks for, but it fires on its own all day, which a timer doesn't. It also goes off by the clock, whether you are at the Mac or not, and syncs to your iPhone if you use Reminders there.

With Shortcuts, on macOS Tahoe

On macOS Tahoe, Shortcuts on the Mac can run automations at a set time of day. Build a shortcut with a single Show Alert action ("Look 20 feet away for 20 seconds") and set automations to run it at a few times through the day. Each automation is one time, so this suits a handful of breaks rather than one every 20 minutes. On earlier versions, such as macOS Sequoia, time-based automations aren't available on the Mac.

Is a reminder every 20 minutes too much?

For most people, yes. Every 20 minutes is three an hour, or 24 interruptions in an eight-hour day. Each one pulls you out of whatever you are doing, and most of them arrive in the middle of a sentence. That is how break reminders end up switched off: not because the advice is wrong, but because the delivery is unbearable.

It helps to remember that the numbers in 20-20-20 are a rule of thumb. Nobody has shown that 20 minutes is better than 30, and research on breaks for screen workers is fairly small. What it suggests is that regular short breaks ease symptoms. Fewer reminders that you actually act on beat many reminders you dismiss without reading.

A rhythm that tends to stick has two parts:

• A handful of reminders a day, spaced through the hours you are actually at the screen, so they never feel constant.
• Habits that fill the gaps. Look up every time you send an email, while a file uploads or a build runs, and every time you take a sip of water. None of these hits 20 minutes exactly, and together they get your eyes off the screen far more often than any timer you would tolerate.

How Notchpals' Eye break and Blink break work

In Notchpals, eye care belongs to whichever Eyes character sits in your crew. Blip, a wide-eyed alien, comes with every copy and starts in the job. Bill, Blush and Professor Hoot, an owl and one of the newest characters, can take it over if you prefer their voice.

An Eyes character brings three moments:

• Eye break, a repeating reminder built on the 20-20-20 idea.
• Blink break, a repeating reminder to blink slowly a few times.
• Dim the screen, once a day between 9 PM and midnight.

When an eye break is due, your Eyes character slides down from the notch with its line:

BlipLook across the room! I'll count twenty seconds. One, two, um, what's next?

It deliberately doesn't try to match the strict rule. Eye breaks and blink breaks come out of one daily budget that every repeating reminder in your crew shares, along with water, posture checks and stretches. The "Repeating reminders a day" setting offers Calm, Normal (the default) and Chatty: 4, 8 or 12 a day, with gaps of at least roughly two hours, an hour, or 40 minutes. So how many eye breaks you see depends on your pace and on who else is in your crew. That is the handful-a-day half of the rhythm above, with the habits doing the rest.

Only minutes you actually spend at the Mac count. Leave the keyboard and mouse alone for a couple of minutes and you are marked away, so a long lunch is not mistaken for a long stretch of screen work. Press Done once you have looked away. Later buys you twenty minutes, once; letting the bubble time out counts as Later too.

The blink break is the other half of the job, for the dryness that comes from staring. Professor Hoot treats it as part of the course:

Professor HootHomework: blink slowly a few times. Late submissions accepted. Barely.

Notchpals has no way of knowing whether you looked away or blinked. Your Done is taken on trust, and there are no stats or streaks to keep up. Professor Hoot's page shows the rest of the professor's lines, if you are choosing between Eyes characters.

Making every eye break count

A reminder only gets you to look up. These make the 20 seconds do more:

1. Give your eyes somewhere far to go. A window, the end of a corridor or a picture on the far wall. The farther the better, within reason.
2. Add a few slow blinks. Close your eyes fully and slowly three or four times while you look away. Blinking more at the computer explains why it helps.
3. Fix the setup. Put the screen about an arm's length away, with its top no higher than your eyes. Turn on automatic brightness in System Settings > Displays, if your Mac offers it, so the screen matches the room.
4. Make text bigger. If you lean in to read, the text is too small. Choose a larger scaled resolution in System Settings > Displays, or use Command and the plus key in most apps.
5. Keep your glasses current. If your eyes still struggle with regular breaks, an eye test is the next step, not more breaks.