How often should you take screen breaks?
“Sit too close and you'll ruin your eyes” isn't quite true. Screens cause fatigue and dryness (we blink less), while myopia is driven most by a lack of daylight. Let's gauge the load and build a break plan.
High load: many screen hours without breaks and little daylight. Screens don't directly "wreck" your sight, but strain and dryness pile up, and a daylight deficit speeds up myopia. Start with 24 20-20-20 breaks and 1–2 hours outdoors.
Sources: American Optometric Association — the 20-20-20 rule; Xiong et al., 2017 (meta-analysis: outdoor time slows myopia). Persistent pain, double vision or sudden vision loss — see an ophthalmologist, not a calculator.
How to use the result
How it works
The tool turns screen hours into short breaks using the 20-20-20 rule.
How to read the result
Breaks may reduce strain and dryness but do not treat eye disease. Lighting and viewing distance also matter.
Limitations
Sudden vision loss, flashes, a curtain-like shadow or eye pain mean seeing a doctor urgently, the same day.
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