The 20-20-20 Rule Explained: Does It Actually Work?
The 20-20-20 rule means every 20 minutes, you look at something 20 feet (6 m) away for 20 seconds. The research is mixed: people who got break reminders had fewer eye strain symptoms, but the benefit faded a week after the reminders stopped. The habit of frequent breaks — and something to remind you — matters more than the exact numbers.
What is the 20-20-20 rule?
The idea is to briefly relax the eye muscles that work hard to focus on a close screen. It's easy to remember, which is why eye care groups and the media recommend it so widely.
What does the research say?
A study that found benefits: in a study by Talens-Estarelles and colleagues, published in Contact Lens and Anterior Eye (2023), software used the laptop webcam to monitor users and send personalized 20-20-20 break reminders. People who got the reminders took more breaks and reported less digital eye strain and fewer dry eye symptoms.
But it didn't last: one week after the reminders stopped, the improvements were gone. The researchers concluded that ongoing reminders are needed to keep the benefit.
A study that found no difference: in another study, 30 people read on a tablet for 40 minutes, and adding 20-second breaks made no meaningful difference to their symptoms. The researchers suggested longer breaks may be worth studying.
So what should you do?
- Use reminders: it's hard to remember on your own — in the research, the benefit only held while reminders were on.
- Don't obsess over 20 seconds: if you can, take a full 1–2 minutes away from the screen.
- Mind your distance too: everyday distance matters as much as breaks. Keep your phone 13–20 in (33–50 cm) away.
- Blink: slowly close and open your eyes a few times during breaks to ease dryness.
Screen Distance alerts you whenever your phone gets too close — a natural nudge to look up and reset.
FAQ
What is the 20-20-20 rule?
Every 20 minutes, look at something 20 feet (about 6 m) away for 20 seconds.
Does the 20-20-20 rule work?
Results are mixed. One study found fewer eye strain symptoms while people received break reminders, but the benefit faded a week after reminders stopped; another found no difference with 20-second breaks. Frequent, slightly longer breaks seem to matter most.
Sources
- Talens-Estarelles C et al. (2023), The effects of breaks on digital eye strain, dry eye and binocular vision: Testing the 20-20-20 rule, Contact Lens and Anterior Eye
- Eyes On Eyecare — 20-20-20 rule may not actually help digital eye strain
- American Academy of Ophthalmology — Computers, digital devices and eye strain
This article is general health information, not a diagnosis or treatment. If eye discomfort persists, see an eye doctor.
