Did you ever close your eyes and push on them with your fingers as a child to see waves and patterns of color float across your eyelids? Perhaps more commonly for adults, have you ever stood up suddenly from reclining or laying down and seen spots swimming across your vision? Or maybe you suffer from migraines that begin as flashes and spots of light crossing the visual field. Hopefully you have never been knocked on the head hard enough to cause flashes of light, but that is another way that you may see strange spots that don’t actually exist. This phenomenon of “seeing stars in vision” is called a “phosphene,” and is the experience of seeing light when no light is actually entering the eye.