I have this odd round shadow on the edge of my vision.
It's not in my peripheral vision, but I can see it when I keep my head still but look to the right iyswim. It's not very big, probably about the size of a football seen from the other end of the room.
It doesn't look or behave like a floater as I can look directly at it and if I turn my head, it stays in exactly the same place on the edge of my vision as I move my head around (like if you wear glasses and can see the corner of the frame, as you turn your head, the frame moves with it keeping it in the same place in your vision).
It's not a complete black spot, I can see through it. It is just a dark shadow.
I am not particularly worried as have had it for a while and if it was anything sinister, it would have made itself aware by now. I was just curious if anyone else had had something similar and what it was.
TIA