# What Is the 20-20-20 Rule? > A plain-English guide to the 20-20-20 rule, what 20 feet can look like, and how to try it for one workday. - **Published**: 2026-05-08 - **Modified**: 2026-10-16 - **Category**: Eye breaks - **URL**: https://trytwenty.com/blog/what-is-the-20-20-20-rule --- The 20-20-20 rule is a simple screen comfort habit: about every 20 minutes, look at something roughly 20 feet away for about 20 seconds. It is not medical treatment, but it can be a useful way to interrupt long stretches of close-focus screen work. ## The rule in one sentence Every 20 minutes, look at something roughly 20 feet away for about 20 seconds. That is the 20-20-20 rule. It is simple enough to remember and, somehow, still very easy to forget. The rule is usually discussed as a comfort habit for screen-heavy days. Twenty does not treat eye conditions, and this guide is not medical advice. Think of it as a small routine for giving your eyes a change of distance before the day turns into one long stare. ## What 20 feet looks like You do not need to measure the room with a tape. The useful idea is distance. Your eyes have been working close-up; give them something farther away to focus on. If 20 feet is not available, choose the farthest comfortable target you can. The habit should stay easy enough that you will actually do it. - A window view across the street. - The far end of a hallway. - A bookshelf across the room if your room is large enough. - A tree, building, or sign outside. - The opposite wall plus a little imagination if your space is small. ## When the rule helps The rule is most useful when your problem is forgetting to interrupt close-focus work. Reading, coding, designing, writing, spreadsheet work, and long message sessions can all pull your gaze into the same short distance for too long. A short break changes the distance, reminds you to blink, and gives your face a chance to relax. It is a small reset, not a cure-all. ## When it is not enough A timer cannot update a prescription, diagnose dry eye, fix lighting, or make a bad display setup comfortable by itself. If discomfort is persistent, painful, worsening, or worrying, an eye care professional is the right person to ask. That boundary matters for Twenty too. The product is useful because it stays modest: it remembers the habit while you work, then gets out of the way. ## Try it for one workday Pick a normal workday, not a perfect one. Set a timer for 20 minutes. When it goes off, look past the screen for 20 seconds. Blink. Let your jaw and forehead soften. Then go back. At the end of the day, ask one honest question: was this easy enough that I would do it again tomorrow? If yes, the habit has a chance. If the browser timer helped, a menu bar reminder can make the rhythm easier to keep during real Mac work. If you are choosing among Mac apps, compare the native timer with Time Out, Stretchly, BreakTimer, and LookAway before you install several of them. ## FAQ ### Is the 20-20-20 rule medical treatment? No. It is a practical comfort habit for screen-heavy work, not a diagnosis, prevention plan, or treatment. Persistent symptoms should be discussed with an eye care professional. ### What should I look at during a 20-20-20 break? Look at something farther away than your screen, such as a window view, hallway, far wall, bookshelf, tree, building, or sign. ### How can Twenty help? Twenty handles the remembering part with quiet Mac reminders and a menu bar timer, while the free web timer lets you try the rhythm first. ## Related - [Try the 20-20-20 timer](https://trytwenty.com/tools/20-20-20-timer): Use the browser timer to test the habit with presets and local settings. - [Calculate eye breaks](https://trytwenty.com/tools/eye-break-calculator): Turn a work block into a simple list of eye-break prompts. - [Use it on Mac](https://trytwenty.com/20-20-20-timer-mac): See how Twenty brings the 20-20-20 rhythm into the menu bar. - [Compare Mac break reminders](https://trytwenty.com/best-break-reminder-apps-for-mac): See a menu bar timer next to Time Out, Stretchly, BreakTimer, and LookAway. ## Sources - [Mayo Clinic: Eyestrain diagnosis and treatment](https://www.mayoclinic.org/diseases-conditions/eyestrain/diagnosis-treatment/drc-20372403) - [American Optometric Association: Computer vision syndrome](https://www.aoa.org/healthy-eyes/eye-and-vision-conditions/computer-vision-syndrome?sso=y) --- - [More Eye breaks articles](https://trytwenty.com/blog/category/eye-breaks) - [All articles](https://trytwenty.com/blog)