The 20-20-20 Rule, and What Actually Helps Eye Strain
Every 20 minutes, look at something 20 feet away for 20 seconds. It's a floor, not a plan.
What the rule actually does
The 20-20-20 rule works because it forces you to change focus distance and blink rate — both drop dramatically when you stare at a screen. It doesn't fix the underlying problem, but it prevents accumulation.
The research on the rule specifically is thin. The research on the underlying mechanisms — accommodative fatigue and reduced blink rate — is strong.
What actually helps
Screen at arm's length, top of the display at or slightly below eye level. Ambient light roughly matched to screen brightness. Deliberate blinking exercises if your eyes feel dry.
Preservative-free artificial tears help many people with computer-vision-related dryness. Skip the products with vasoconstrictors — they treat redness, not the underlying dryness.
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When to see a professional
Persistent eye strain that doesn't improve with breaks and setup changes is a reason to get an exam — you may need a computer-distance prescription that's different from your everyday glasses.
The Active Nerds Team
Engineers and lifters writing practical fitness content for people who spend their day at a keyboard.