Do you stare at the computer more than 4 hours a day? Do your eyes feel tired and strained by the middle or end of the work day? Do you regularly experience headaches by the end of your day or sooner? Does your neck and back ache as you tilt your chin and adjust your head to see the computer screen through your progressive glasses all day?  These concerns and more are all related to a condition known as computer vision syndrome, also known as digital eye strain. If this sounds like you or a loved one, don’t worry—you’re not alone. Digital eye strain affects more than 70 percent of the approximately 143 million Americans who work on a computer on a daily basis, according to the American Optometric Association (AOA).