Thanks for this additonal information. Based on what you've told me, this sounds like you've experienced an "entopic phenomenon". This is an example of the retina being stimulated by a brighter environment. The retina tends to retain the shape of this lighter object for a small amount of time and then dissipates slowly. I don't suspect that you are experiencing anything of significant worry or concern.
If you do begin to have headaches associated with these, or you start to experience flashing lights (like strobes) or a sudden onset of new specs or dots in the vision or if the vision itself starts to worsen significantly, then these are reasons to see your eye doctor because they could represent problems with the retina.
Does this information help address your concerns? Does this make sense? Do you have any other concerns that I haven't addressed?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.