No results with tDCS on visuals for me, but no reason why it wouldn't work for someone else! I did experience flickering in my field of vision, so something was happening. I should also mention that my visuals aren't the same/as extensive as others -- I have brightness and starburst patterns, no trails, and very little snow. So perhaps there are different pathway issues for different visual problems. It's still incredibly irritating and seems reflect some kind of cascade throughout other brain regions.
Next, I will try photobiomodulation (the Vielight Neuro Duo 3 + X plus), which acts on the default mode network in the gamma and alpha wave range (+ the X-plus works on the occipital lobe). Hallucinogens act on the default mode network, and, if you found your way to this thread, you would also know that (some believe) HPPD is also an expression of damage or disruption to the occipital lobe, causing hyperexcitability. The combination of these two devices by this manufacturer is worth exploring. Lots of research on the Vielight site validating the tech and the approach modulating the outer cortex. It costs about 3K. I'll use it for awhile and can report back.
Then, if I can find the money (~6K) I'll also try the PoNS device. PoNS works to stimulate the midbrain (the internal brain structure) through the tongue, and it has made a miraculous difference for folks with traumatic brain injuries and MS. That includes improvement in visual processing, balance, tinnitus, and emotion regulation, depending on the rehabilitation protocol. It's theorized that PoNS does this by repairing interneurons. If you've done your reading, you'll know that one theory re: HPPD is that it reflects damage to interneurons, causing hyperexcitabilty in certain parts of the brain; hypoexcitability in other parts, including the prefrontal cortex.
Between those two technologies, I will have tried acting on both the internal and the external structures of the brain.
