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Your eyes have a 20-foot escape hatch
💡 Every 20 minutes on a screen, look 20 feet away for 20 seconds — it lets your eye's focusing muscle relax and your blink rate recover.
Stare at a screen for hours and your eyes start to burn, blur, and ache. A big reason: focusing up close forces the tiny ciliary muscle inside your eye to stay contracted, like holding a clenched fist. And screens make us blink far less — often less than half our normal rate — so the surface of the eye dries out.
The fix eye doctors actually recommend is the 20-20-20 rule: every 20 minutes, look at something at least 20 feet away for 20 seconds. Twenty feet is roughly the distance at which your focusing muscle can fully relax, so the short break lets it unclench before it cramps. The 20-second window also gives you time to blink normally and re-wet your eyes.
It costs nothing and needs no gadget — glance out a window, down a hallway, or across the room. The American Academy of Ophthalmology promotes it as a simple habit against digital eye strain. Note the catch: it eases the muscle fatigue and dryness, but it won't fix uncorrected vision problems, so persistent strain is still worth a real eye exam.
Source: American Academy of Ophthalmology — Computers, Digital Devices and Eye Strain