Move over, drunk driving—there could be a new car crash culprit: Dry eyes slow down your reaction time behind the wheel, finds a new French study. In a driving simulator, participants pressed a remote on their steering wheels every time they saw a target appear on the road. Compared to people with healthy peepers, drivers with dry eyes missed twice as many marks and had significantly delayed response times. Up to 30 percent of Americans suffer from dry eyes, with symptoms such as stinging or burning, irritation, and excess tearing—especially when driving, reading, or watching TV. In healthy eyes, blinking stimulates tear secretion and creates a new layer of tear film that moistens your eyes. However, dry eyes are due to a problem with that tear film, which may impact your vision even after you blink, explains study author Alexandre Denoyer, M.D., Ph.D., of the French National Ophthalmology Hospital. To see more details visit, news.menshealth.com