The 20-20-20 rule involves taking a 20-second break from looking at a screen every 20 minutes. During the break, a person focuses on an object like a tree or a building that is at least 20 feet away,...
The 20-20-20 rule involves taking a 20-second break from looking at a screen every 20 minutes. During the break, a person focuses on an object like a tree or a building that is at least 20 feet away,...