The average person looks at their smartphone 150 times or more per day. All that staring from frequent phone use, computer use, and TV-watching can all lead to eye strain, an eye health issue that, when found in this context, is often called Computer Vision Syndrome.It’s predicted that 2 out of every 3 Americans will experience eye strain caused by excessive phone use. Computer vision syndrome can lead to blurred vision, dry eyes, sore eyes, and headaches. Here are the main reasons why eye strain from phone use can cause these symptoms:Blinking Less Often: Blinking helps your eyes redistribute moisture, keeping them from getting dry, and also acts as a natural defense against excessive exposure to outside elements like dust and sunlight. You should blink about 15 times per minute. That number goes down by half when you stare at your smartphone, giving your eyes much less time to recover.Squinting: You may not mind reading smaller text on a smartphone screen, but your eyes sure do. Squinting at on-screen text and videos overworks your muscles around your eyes, neck, and shoulders, and is a major cause of eyestrain and blurred vision.Excessive Glare: Our eyes aren’t meant to stare directly at light for long periods of time, which is why the glare from the light of your cell phone screen can cause eye strain. Using your phone in the dark to check your emails or social media only exacerbates these negative conditions.