The 20-20-20 Rule: Does It Actually Work?
TL;DR — the 30-second version: Every 20 minutes, look at something about 20 feet (roughly 6 meters) away for 20 seconds. That’s the whole 20-20-20 rule. We tested it for two weeks at a desk and screen time got noticeably easier. It costs nothing, it needs no app, and it won’t fix your glasses prescription…
