Most Americans sit for at least six hours a day—an act that has been linked to obesity and heart disease, among other ailments. Mounting evidence suggests long hours staring at computer monitors may also be taking a toll on the eyes. People peering for hours into a screen tend to blink less often and have tears that evaporate more quickly, which dries out the eye and can cause blurred vision or pain. Left untreated, dry eye can lead to corneal ulcers and scarring.
