The 20-20-20 rule and simple eye breaks for screen workers
Digital eye strain is the low-grade headache, dryness, and blur that shows up after too many hours of screen time. The 20-20-20 rule is the tiniest possible intervention — and, for most people, the most effective one.
What the 20-20-20 rule is
Every 20 minutes, look at something 20 feet (about 6 metres) away for 20 seconds. That's it. The rule was coined by optometrist Jeffrey Anshel, and it has stuck around because it's short enough to remember and long enough to matter.
Why it works
Two things go wrong when you stare at a screen. First, your eyes stay locked at the same close focal distance for hours — the tiny muscles that control focus (the ciliary muscles) don't get to relax. Second, you blink around a third as often as normal, which dries the surface of the eye.
Looking far away lets the focusing muscles release. And any short pause encourages a few full blinks, which resurfaces the tear film. Twenty seconds isn't magical — it's just about how long it takes for both to happen.
What "20 feet away" means in a small room
Six metres is further than most home offices. Don't over-think it — the goal is "as far as you can see". Out a window is best (bonus: natural light). Down a hallway works. Even the opposite wall of a small room is better than nothing, because the change in focal distance is what matters.
Extra 30-second eye resets
- Palming. Rub your hands together to warm them, cup them lightly over closed eyes, breathe.
- Slow blinking. Ten deliberate, complete blinks — close fully, pause a beat, open.
- Figure-eights. Trace a lazy horizontal figure-eight with your eyes for 20 seconds. Reverse.
- Near-far focus. Hold a finger 15cm from your nose. Focus on it, then focus on something across the room. Ten rounds.
The remembering problem
The 20-20-20 rule is trivially simple and almost impossible to actually follow, because deep work makes you forget your eyes exist. You need a nudge from outside your brain.
Small Movements, Often is a browser tab designed for exactly this: it chimes gently at the interval you choose, and includes eye rests and breathing prompts alongside the stretches. Set it to 20 minutes and the rule takes care of itself.