CHAIR
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Well-being
About every twenty minutes, look away from close-up work toward something farther away for a brief pause.
When you're absorbed in a screen, it's easy to look up and discover that an hour has passed. The 20-20-20 rule is a simple reminder to interrupt that pattern: roughly every twenty minutes, look at something about twenty feet away for twenty seconds.
You don't need to measure the room. Pick a comfortably distant object, look away from the display, and blink naturally. Don't stare at the sun or strain to focus on something you can't see clearly.
The end of a paragraph, a saved document, or a quiet reminder can be the cue. Let your hands leave the keyboard too. Keep longer breaks and a comfortable screen setup in the day; this brief exercise doesn't replace them.
If your eyes remain dry, painful, or blurry, an eye-care professional can help identify the cause and advise on treatment. Don't change prescribed eye drops or assume that all eye discomfort comes from screens.
The rule is a useful prompt, not a guarantee or an eyesight correction. Its everyday value is simple: it reminds you to stop doing close-up work without a pause.
Further reading: American Academy of Ophthalmology EyeWiki: digital eye strain
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