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Screen Time & Eye Strain Timer
Browser-based 20-20-20 rule reminder timer.
The 20-20-20 rule: every 20 minutes, look at something 20 feet (about 6 metres) away for 20 seconds.
Press Start, then keep working. The timer will prompt you to look away.
How it works
The 20-20-20 rule is a simple habit for screen workers: every twenty minutes, spend twenty seconds looking at something about twenty feet away. Close work keeps the eye's focusing muscle contracted, and distance viewing lets it relax, while deliberate blinking re-wets the eye surface. This timer runs a twenty-minute work countdown, then a twenty-second break countdown, and repeats. It needs no permission to work; browser notifications are only an optional extra if you have already allowed them.
How to read the result
The display shows which phase you are in and how long remains. A completed break count tells you how consistently you actually paused, which is more useful than a single reminder. If your eyes feel dry, gritty or tired despite regular breaks, the cause may be screen height, glare, uncorrected vision or simply too few breaks from screens overall, and an eye check is worth booking.
One practical tip
Put the distant target in place before you start: a window view, a hallway end or a picture across the room. When the break arrives, you should be looking away within a second, not spending half the break deciding what to look at.
Pair the timer with screen ergonomics: the top of the screen roughly at eye level, comfortable brightness that matches the room, and a distance of about an arm's length all reduce strain that breaks alone cannot fully fix.
If you wear contact lenses, blinking deliberately during each break matters even more, since lenses can increase dryness and the timer's short pause is an easy moment to restore the tear film.