Endlessly staring at a computer screen can (temporarily) harm your vision

"Computer vision syndrome" refers to symptoms like irritated and tired eyes that result from starting at a digital screen all day. As Business Insider's Kevin Loria reported, one report found that the syndrome affects more than 60% of Americans.

One way to avoid eye strain is to implement the 20-20-20 rule: After every 20 minutes of work, take 20 seconds to look at something 20 feet away.

As Loria explains, "Your eyes have muscles that help them move and focus on different objects, but if we stare at a screen the same distance away for hours at a time, those muscles have a hard time adjusting once we move again."