Use the 20-20-20 rule to save your eyes from the strain of working at the computer. February 17, 2017 by Ryan O'Ramsay Barrett How long have you been staring at your screen? Friendly reminder here: use the 20-20-20 rule to save your eyes! After 20 minutes of screen time, stare at something 20 feet away for 20 seconds. Your eyes will thank you.