The 20-20-20 Rule: Does It Actually Work? An Optometrist Explains

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You’ve probably heard it: every 20 minutes, look at something 20 feet away for 20 seconds. It’s the most-repeated piece of eye health advice on the internet, recommended by everyone from ophthalmologists to tech bloggers.

How Your Desk Setup Affects Your Eyes 2026: Optometrist's Guide to Monitor Distance, Lighting & Ergonomics

Affiliate Disclosure: Desk Wellness Lab is reader-supported. Links in this article may be affiliate links — if you purchase through them, we earn a small commission at no extra cost to you. This never affects our recommendations. See our full Affiliate Disclosure.

I’m an optometrist. Five days a week, patients sit in my exam chair and tell me the same story: “My eyes feel tired by 3 PM.” “I get headaches in the afternoon.” “Everything gets blurry after staring at my screen for a few hours.” “My eyes feel dry and gritty.”