The 20-20-20 Rule
Every 20 minutes, look 20 feet away for 20 seconds to rest your eyes
- Difficulty
- Starter
- Time to result
- ~days to results
- Steps
- 4
- Confidence
- 55%
The 20-20-20 rule is a simple micro-break protocol for screen-heavy work: every 20 minutes, look at something more than 20 feet away for 20 seconds. Near-work keeps the eye's focusing muscles contracted for long periods, which contributes to eye strain and, over time, is associated with rising myopia rates, especially as daily screen time climbs. Periodically relaxing focus into the distance gives those muscles a rest. The rule's value is its memorability; it's easy enough to actually run all day. Williamson notes it pairs naturally with other movement and posture breaks, though stacking too many overlapping timers can become unwieldy.
Origin
Referenced by Chris Williamson from an earlier Modern Wisdom episode as a widely known eye-care guideline for screen users, raised in conversation with Bob King about the rise of screen-driven eye problems and myopia.
Core principles
- 01Sustained close-up focus on screens strains the eyes and is linked to rising myopia
- 02Brief, frequent breaks relieve the strain of near-work
- 03Looking into the distance relaxes the focusing muscles of the eye
- 04The rule is simple enough to actually remember and do
How to run it
- 1
Set a 20-minute cue
While doing focused screen work, use a timer, app or natural task boundary to prompt you roughly every 20 minutes.
Pro tip Tie it to a work rhythm you already use so it doesn't become one more competing alarm.
- 2
Look 20 feet away
When prompted, shift your gaze to any object more than 20 feet from you, ideally out of a window.
Pro tip Distant natural light also supports the sleep and eye-development benefits of outdoor exposure.
- 3
Hold for 20 seconds
Keep your focus on the distant object for at least 20 seconds so the focusing muscles genuinely relax before you return to the screen.
Watch out A one-second glance doesn't count; give it the full 20 seconds.
- 4
Repeat through the day
Run the cycle continuously across your working hours rather than treating it as a one-off.
Watch out Don't stack so many overlapping timers (breaks, stands, walks) that the system collapses under its own complexity.
In the wild
Williamson tried running the 20-20-20 rule alongside the Pomodoro technique and sit-stand reminders at the same time. The overlapping intervals became an 'endless spirograph of intersecting timings' that was hard to actually follow. The lesson isn't that the eye rule is wrong, but that layering too many independent timers defeats itself; the 20-20-20 rule works best kept simple.
→ The rule is easy to run on its own but becomes unworkable when stacked with several competing break schedules.
Common mistakes
Glancing away too briefly
Snapping your eyes across the room for a second doesn't relax the focusing muscles; the 20-second distant hold is the part that matters.
Drowning it in competing timers
Running it alongside multiple other reminder schedules makes the whole system too complex to sustain, so nothing gets done.
Is it for you?
Best for
Office and remote workers who spend long stretches staring at monitors or phones.
Not ideal for
People whose work involves little screen or close-up focus, or who already break their gaze frequently.
From the transcript
“So for 20 minutes every 20 minutes for 20 seconds you look at something that is more than 20 ft away.”
From the episode
The Health Crisis Of Office Jobs - Bob King - #1098
Bob King