20-20-20 Eye Health Timer
Protect your eyes from digital strain with a guided 20-minute timer and break reminders.
20-20-20 Eye Health Timer
Protect your eyes from digital strain with a guided 20-minute timer and break reminders.
Please ensure your browser or system sound is turned on so you can hear the chime when it is time to look away.
How This is Calculated
The 20-20-20 rule: every 20 minutes of screen time, look at something 20 feet (6 m) away for at least 20 seconds. This resets the ciliary muscle and reduces accommodation fatigue. Originally recommended by California optometrist Jeffrey Anshel and endorsed by the American Academy of Ophthalmology.
Disclaimer: This tool provides estimates for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
How to Use This Calculator
Use the 20-20-20 rule to prevent digital eye strain.
- Step 1: Click "Start Timer" when you begin working at your screen.
- Step 2: Every 20 minutes, the timer will alert you.
- Step 3: Look at something 20 feet (6 meters) away for 20 seconds.
Frequently Asked Questions
Also known as computer vision syndrome, it causes dry eyes, blurred vision, and headaches due to prolonged screen use and reduced blinking.
Looking at objects at least 20 feet away allows the ciliary muscles in your eyes to completely relax, relieving the tension caused by focusing on a near screen.
