I think this is a good theory. As mentioned in my other reply, my symptoms didn't start until about a week afterwards when I started having panic attacks. From

I think this is a good theory. As mentioned in my other reply, my symptoms didn't start until about a week afterwards when I started having panic attacks. From there, the anxiety caused the visual symptoms (I may have even read about them online). It's entirely possible that I just inadvertently trained myself to see the unfiltered raw output from my visual cortex, which I previously ignored. If you read about any HPPD communities it seems inextricably linked to anxiety, but hard to know which is the cause and which is the effect.