I'm guessing he is talking about this: http://www.mayoclinic.com/health/ocular-migraine/AN01681/ http://www.mayoclinic.com/health/ocular-migraine/AN01681/ I ge

I'm guessing he is talking about this: http://www.mayoclinic.com/health/ocular-migraine/AN01681/ http://www.mayoclinic.com/health/ocular-migraine/AN01681/ I get them from time to time; the only down side is the inability to read until the flashing zig-zag hallucination moves out of my field of view. Generally much preferred to a migraine headache.