Every 20 minutes, look at something 20 feet away for 20 seconds. Start the timer below and let your eyes breathe.
When you stare at a screen, your blink rate drops from about 15 times per minute to fewer than 5. Your eye muscles hold the same focal distance for hours. The result is digital eye strain — a cluster of symptoms that affect an estimated 65% of regular screen users.
The 20-20-20 rule was popularized by optometrist Dr. Jeff Anshel. Looking at something 20 feet away relaxes the ciliary muscles inside your eye — the same muscles that tighten to focus on close objects. Twenty seconds is enough time for a full reset.