justj
This is strange, but I just experienced for about a 1/2 hour a flashing prism type circular border around the border of my left eye vision. The right eye was fine. It's hard to explain, it was not a floater. It was a pulsating around the outside border of my left eye with a prism effect. It lasted for about a half an hour. I have been having sinus problems, so I thought it might be the pressure of the sinus cavities. Any ideas?