seeing sparkles in vision/eyes?

Yesterday after completing HBOT I noticed sparkles in my vision it quickly went away in a few seconds but what does that mean? Anyone have that happen to them?
Thanks in Advance!

blood pressure spikes without pots.

For me, that means I'm getting a migraine. Scared me the first time I saw that.

For most of my life i saw sparkles .it seemed to be a blood sugar or insulin resistance thang .i would have episodes where first sparkes then loss of periphial then blackout ...if i sat breathe and ate honey the episode could be stopped ..later a static would happen at night and i have great nightvisuon .something like snow on a tv ...so spirulina and honey helped build glycogen stores in liver and treating lyme for pancrearic function and treating toxo and bart has helped my eyes ,also using tobramycin abx and bee venom eyedrops ...