Does the 20-20-20 rule work?
Short answer
Partly. In a 2023 trial, reminders to follow the 20-20-20 rule eased digital eye strain symptoms over two weeks, but the benefit was gone a week after people stopped, and the signs of dry eye measured in the clinic didn’t change (Talens-Estarelles, 2023). Another 2023 study found that 20-second breaks during a 40-minute task did not reduce symptoms. It’s a reasonable habit, not a fix.
What the rule says
Every 20 minutes, look at something about 20 feet (6 metres) away for 20 seconds. The idea is to rest the focusing muscles that hold your eyes on a near screen, and to give you a moment away from it.
The numbers are easy to remember, but there is little research behind them. Johnson and Rosenfield’s 2023 paper asked whether they are justified, and its results did not support 20-second breaks as a treatment for eye strain.
What the studies found
Talens-Estarelles and colleagues gave 29 computer users with symptoms software that used the laptop’s webcam to time personalised reminders to follow the rule, for two weeks. Symptoms of digital eye strain and dry eye went down while the reminders ran. A week after they stopped, the improvement had gone, and two weeks wasn’t enough to change the signs of dry eye or binocular vision measured in the clinic.
Johnson and Rosenfield had 30 young adults do a demanding 40-minute reading task on a tablet four times, with a 20-second break every 5, 10 or 20 minutes, or none. Symptoms rose in every session, and the breaks made no significant difference.
Taken together: looking away helps some people feel better while they keep doing it, and the effect doesn’t last on its own. The same happened with blink exercises in a 2025 study: the gains faded once people stopped.
Breaks are only half of it
A break every 20 minutes does nothing for the 20 minutes in between, when blinking drops to a fraction of its resting rate. Reviews of digital eye strain point to reduced and incomplete blinking as a main cause of dryness, and a cue to blink can raise blink rate during the work itself (Nosch, 2015).
How to make it stick
- Use a reminder that leaves by itself, so you don’t learn to dismiss it.
- When it comes, look out of a window or to the far end of the room, not at your phone.
- Let it wait for a pause in your work, so you don’t switch it off out of irritation.
- Keep it going: the studies suggest the benefit lasts only as long as the habit.
BlinkPause offers a 20-second look-away break every 20 minutes, with a soft bowl and a spoken guide so your eyes can stay off the screen. It waits for calls, video and a pause in your typing.
No camera, no account, no tracking. Coming soon to Chrome, Edge and Firefox. Phone browsers don’t run extensions. Add it on your computer.
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Sources
- Talens-Estarelles et al. (2023), The effects of breaks on digital eye strain, dry eye and binocular vision: testing the 20-20-20 rule
- Johnson and Rosenfield (2023), 20-20-20 rule: are these numbers justified?
- Nosch et al. (2015), Blink animation software to improve blinking and dry eye symptoms
- Sheppard and Wolffsohn (2018), Digital eye strain: prevalence, measurement and amelioration
- Wolffsohn et al. (2023), TFOS lifestyle: impact of the digital environment on the ocular surface
This page explains research for general interest. It isn’t medical advice, and BlinkPause is a reminder, not a medical device.