The American Academy of Ophthalmology explains that looking at digital devices won’t necessarily damage your eyesight. But it can cause strain and unpleasant symptoms. Humans normally blink around 15 times each minute. When staring at screens, this number decreases to a half or a third of that amount. That can lead to dry, irritated, and tired eyes.⁠ ⁠ Eye strain caused by screens has its own name. It’s called computer vision syndrome (CVS). In a study published by the Nepalese Journal of Ophthalmology, researchers examined computer use and its effects on the eyes of university students in Malaysia. Almost 90 percent of the 795 students had symptoms of CVS after just two continuous hours of computer usage.⁠ ⁠ Taking frequent breaks to look at faraway objects during screen time significantly lessened their eye strain symptoms. In other words, the 20-20-20 rule works.⁠ While many doctors suggest the 20-20-20 rule is the best line of defense, researchers explain that any break from repeti...