Hi, I have noticed a small dot on the vision on my left eye. But there is no dots or spots in the actual eye. But if I see a plain white paper or the wall, I see a tiny black spot which is moving as my eye moves. It's so tiny which is clear to see only if I see the wall or the white paper. It started few days ago. I have severe allergies recently and have throat congestion, nasal congestion and post nasal drip. I have running eyes and running nose too. Is this black spot thing something serious? Will it go away? The small dot just moves as my eye ball moves. But only on one eye. I still have allergies and nose, throat and eye irritation. I am taking antihistamine as given by my Dr. I didn't see the eye Dr yet. Is this black spot on the vision/eyesight something serious?