The Best What Causes Flashing Lights In Eyes Ideas. This causes you to see squiggly lines or threads. Flashes of light you see even when you’re not looking at light have a medical name — photopsias.

The vitreous jelly shrinks as you get older,. Web eye floaters (myodesopsias) eye floaters happen when your vitreous humor (fluid) changes its thickness. A small number of people who undergo this normal.