20-20-20 Eye Strain Prevention Timer
Every 20 minutes, shift your eyes to look at an object 20 feet away for 20 seconds. Recommended by optometrists worldwide.
The 20-20-20 rule is an ergonomic health guideline designed by optometrist Dr. Jeffrey Anshel: every 20 minutes spent looking at a screen, glance at something at least 20 feet (6 meters) away for a minimum of 20 seconds to relax your eye ciliary muscles.
The Science of Digital Eye Relaxation
When staring at monitors and phones, humans blink up to 66% less frequently, and the ciliary muscle contracts continuously to keep near objects in focus. Looking into the distance allows the eye muscles to fully relax.
- Prevents headaches, dry eyes, blurred vision, and neck fatigue.
- Takes just 20 seconds — zero disruption to overall work momentum.
- Re-lubricates the cornea by encouraging natural full blinking.
How to Follow the 20-20-20 Rule
Start the 20-minute screen countdown timer.
Work normally on your computer or phone.
When the chime rings, look away from all screens out a window or down a long hallway.
Focus on an object roughly 20 feet (6 meters) away for the 20-second countdown.
Blink several times softly, then resume your session.
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Common Questions About 20-20-20 Rule Timer
Does the 20-20-20 rule really work?+
Yes. Research published by the American Academy of Ophthalmology and Aston University confirmed that periodic distant viewing significantly reduces digital eye fatigue and dry eye symptoms.