Digital screens are pervasive at work and in homes and schools stores. The American Optometric Association says an estimated 104 million Americans of working age spend more than seven hours a day in front of screens. All that screen time can take a toll. Too much exposure to screens can lead to dry eyes, blurry vision, headaches and watery eyes. Experts say taking frequent breaks to look in the distance can help alleviate symptoms. Using larger monitors and fonts, and adjusting screen position also can help.