After a series of ER visits from people who suffer temporary blindness, it was imperative for scientists and doctors to figure out why. They came up with the term for the new condition: transient smartphone blindness. Blindness can occur when you use a bright smartphone with one eye closed for extended periods of time, such as when you're in bed and one of your eyes is being shielded by a pillow. When you try to open both eyes afterward, you can be blinded due to the extreme discrepancies in ambient light being captured from each eye. The condition isn't serious as the eye tends to correct itself within 15 minutes.