There are several of us on here who have a similar eye complaint: seeing a bright flash, like the afterimage of a flash bulb, when we blink, and sometimes, on upgaze. This is transient symptom for most of us, lasting anywhere from a few days to a few weeks. When the "spot" in our visual field passes over a dark background, the spot appears light. When the spot passes over a light background, it appears dark.
So far, the doctors haven't been able to diagnose us, and perhaps that means it is simply some idiopathic phenomenon. But, in any case, I'm wondering what other similarities we might all have that could bring us closer to a an explanation.
For instance, other factors about me which might be clues are:
I take 100 mg of Zoloft a day
I would describe myself as high-anxiety and stress
I clench my teeth, usually on the same side as the effected eye
I have alot of sinus problems around my eyes
I have double vision due to a weak muscle in one eye
I have many floaters and one very prominent one in the eye without the bright spot
How about you?