The 20-20-20 rule is a simple prompt for people who spend long stretches focusing on a screen: every 20 minutes, look roughly 20 feet (6 metres) away for 20 seconds. The American Optometric Association recommends it as one way to help alleviate digital eye strain.
Pick a distant object—through a window, down a hallway, or across a large room. Let your eyes settle on it for a full 20 seconds. You do not need to stare hard or stop blinking.
Why look into the distance?
Screen work is sustained near work. Shifting your gaze farther away changes the visual demand for a moment and creates a useful pause. The rule also interrupts the tendency to work continuously while blinking less often.
Think of 20 feet as an easy-to-remember target, not a measurement you need to police. If your room is small, look through a window or choose the farthest clear point available.
How to do it
- Pause without switching screens. Opening another app is not an eye break.
- Look far away. Choose something beyond your normal desk distance.
- Relax your gaze. Blink normally; a few deliberate, complete blinks can help if your eyes feel dry.
- Stay for 20 seconds. One slow breath cycle can make the pause feel natural.
- Return to work. The goal is a sustainable reset, not losing momentum.
How to remember eye breaks
The difficult part is rarely understanding the rule. It is remembering it while absorbed in work. A repeating phone alarm works, but it may be noisy and disconnected from your Mac workflow. Calendar blocks are useful for longer breaks, but too coarse for short distance changes.
A dedicated eye break reminder for Mac can keep the timing close to the work, pause when you step away, and avoid interrupting presentations. EyeRest Flow is designed around that approach.
Does it have to be exactly every 20 minutes?
No habit survives if it is too rigid for real life. Twenty minutes is a useful default. If you are presenting, in a meeting, or away from your desk, treat the rule as a rhythm rather than a test. Natural pauses count. What matters is breaking up prolonged near focus consistently.
What the rule does not do
The 20-20-20 rule is a comfort habit, not a diagnosis or treatment. Persistent pain, headaches, double vision, marked redness, or changes in vision deserve professional advice. An eye-care professional can also check whether an uncorrected vision issue is contributing to discomfort.
Sources
- American Optometric Association: Computer vision syndrome
- American Academy of Ophthalmology: Headache and eye strain
This article provides general information and is not medical advice.