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Is the 20-20-20 Rule for Eye Strain Effective? Studies Test the Theory

If you spend hours staring at screens each day, you have probably heard the advice. Every 20 minutes, look at something 20 feet away for 20 seconds. The 20-20-20 rule for eye strain has become the go-to recommendation from eye doctors, productivity influencers and ergonomics guides. But newer research suggests it may not deliver on all its promises. That gap between popular guidance and clinical evidence matters because digital eye strain affects nearly anyone who works on a computer, scrolls a phone or watches a tablet for long stretches. Symptoms include dry eyes, headaches, blurry vision an...