I am also very happy to see other people experiencing this phenomenon. I think it's very helpful if we all explain our situation details to see if we're experiencing the same issue!
I have been seeing my tiny blue dot for about 5 years, I'm 29 years old. It is always in the upper left quadrant of my visual field (it never changes position, like others have said). It looks exactly like a tiny round LED dot like a light on some electronics. Bright, vibrant, royal blue. It comes randomly only for a second or less (I wouldn't even say 2 seconds), and doesn't seem to have a trigger. Like others have said, it can be many times throughout one day, or I might not see it for days or even a week or two. But, it always comes back sometime. When I am extremely over-tired and possibly stressed I think I do tend to see it slightly more often, but even when I am well rested and happy, it shows up randomly.
I have a history of migraines since I was about 14, and besides the headache part, my migraine symptoms often include numbing of my hands, unusual speech (words coming out that I wasn't thinking of), visual symptoms like a big grey hole in my vision, and one time I saw those wavy lines all across my vision. I have always attributed this blue dot (and some doctors think this too) to my migraine tendencies, and whatever is going on up there neurologically.
I saw an 'eye doctor' a couple of years ago, and he checked my eyes thoroughly including as far as he could see down my optic nerve. He told me everything looks great and he cannot see any way this would come from a visual problem, so this makes me think that whatever is causing this, is starting in the brain.
This past year it seems that the blue dot has gotten a tiny bit bigger, it used to be just a teeny tiny pinprick of a thing, but now I would say its getting closer to a pinhead. Still tiny, but, still, I am pretty sure it's increase in size a bit. This is making me want to revisit a doctor.
Have any of you been to doctors for this, or has your blue dot progressed into anything else?
One or all of us should get some kind of brain imaging done!
It's so comforting to see other people alive and well with this issue. Please keep this thread alive with updates or more details of your blue LED light condition! I'm turning on my notifications for responses to this thread because I really would like to figure this out, at least a little, some day.