The 20-20-20 rule
The fix
Every 20 minutes, look at something ~6 m (20 ft) away for 20 seconds.
Why it happens
Sustained near-focus keeps the eye's focusing muscle contracted and suppresses blinking. A distant glance relaxes it and resurfaces the tear film.
If you ignore it
A simple, evidence-backed habit that reduces digital eye-strain symptoms during long screen sessions.
Wellness & ergonomic guidance, not medical advice.