I know many of you have had eye issues. So far, I had been fortunate. But would appreciate you thoughts on this:
Last night I suddenly was seeing flashing color lights in a circle around the left side of my center vision. Inside the circle was very distorted and could not make out the image I was looking at. The circle got larger and lasted for about 20-30 minutes then seemed to disolve. Seems fine today.

I have had floaters before, but this was much different.
Any ideas as to what it might have been?
Thank you.