Lately I sometimes see a cluster of about 3 darkish spots in my vision, which move slowly when I look at them. At first I thought they were just floaters, but when I close one eye I see them, and then when I switch eyes (that is, close the other eye instead) they are still there, in the same position and continuing the same movement as in the other eye. So I am seeing the same strange spots in both eyes?
The closest image I can find on vision simulators that looks like them is scotoma, except they are not that dark, they are greyish spots, round not strings.
What might this be? It's so strange that I see the same image from either eye.