Description from extension meta
20-20-20
Image from store
Description from store
Popup that appears on screen every 20 minutes to remind you to look away from your screen and relax your eyes.
This extension uses the "20-20-20" rule - look 20 feet away for 20 seconds every 20 minutes. Studies show that staring at a screen for prolonged periods of time can cause myopia (nearsightedness) or worsen existing myopia. This extension will remind you to take a break.