I am here as I ve just done an internet search on tiny black disappearing dot. I, just as the last questioner, have had three times in the last 2 days the same odd occurrence. I have floaters, so I know it is not that.. It s odd and eery to the point I have contemplating unknown phenomena, ghosts, time and space and such. Sounds weird I know, but it is weird enough to make me notice and attempt to understand it.