American workers are spending too much time looking at screens.

More than 104 million people in the U.S., including nearly 70% of people working office jobs, spend upwards of seven hours a day looking at screens, according to a Tuesday report from the Deloitte Economics Institute and the American Optometric Association.

As a result, symptoms of “excessive screen time,” or more than seven hours of screen time a day, are costing the U.S. $73 billion per year, the report said. The figure was determined by analyzing the direct financial costs incurred by health systems, the symptoms’ impact on productivity at work, and their perceived impact on an individual’s well-being.