How many hours a day do you spend looking at a computer, phone, tablet, TV, or other digital device? According to a recent survey, it’s at least nine hours for most of us. With our eyes logging so much screen time, it’s no surprise that we often end the day with eye strain, blurry vision, and even headaches.But what’s really causing these symptoms? In the video above, VSP optometrist Gary Morgan explains why the blue light emitted from digital devices causes your eyes to work overtime and what you can do to protect your vision from blue light exposure.