I have had this vision before since 2015:
Gorgeous sparkles and flashes of red and yellow. I had just turned off the lamp on my night table to sleep, and a “show” began ¦ It was like gorgeous fireflies. Finally, the sparkles went away, seguéing into patterns of blue and green, like a wallpaper pattern, and gradually dissipated.
I do see an ophthalmologist and eye surgeon in Houghton, Michigan every six months for a modest glaucoma issue, which eye drops fix very well, and I asked her about such sights and if there was any medical explanation for it.
She listened very, very carefully, of course, and then looked at me blankly, and said: “No, I have never heard of anything at all like that.”
The last time I had a vision it was scary and slightly ambiguous, but clearly saw a communist star swallowing up the Earth…