Here’s a term to ask your optometrist about: Phosphenes are the shapes and spots of light seen when the eyes are closed. These lights occur because the cells of the retina are stimulated, usually by pressure (rubbing the eyes, coughing, etc.). The noun comes from the Greek noun “phōs,” meaning “light,” and the Greek verb “phainein,” meaning “to show.” Seeing phosphenes when you close your eyes is a normal occurrence, but if you see dark spots, excessive floaters, or other flashes when your eyes are open, you should consult your doctor.