Simple 20-20-20 screen rule really does help with eye strain, research shows

It's long been recommended as a way of easing eye strain while working at a computer screen. Now the 20-20-20 rule—taking a break of at least 20 seconds, every 20 minutes, to look at least 20 feet away—has been confirmed by scientists at Aston University to help ease some of the symptoms of prolonged computer use.