for me, the most notable times I got hppd were from a 700 seed dose of Morning Glory Heavenly Blue seeds, in which the blotches of color that appear behind my eyes seemed to have more activity and/or meaning then they usually have, for about two weeks. Other than that, when I vaporized 25i it felt like a chunk of my brain stopped working for two weeks without me even realizing it til much later. I don't remember any recurring visual phenomena, just feeling like a space cadet 24/7 and forgetting what I was saying in the middle of my sentences, things like that. Weed makes me get visuals but it always has, and I smoke weed pretty much constantly. When I'm exceptionally stoned I see afterimage dots flying around my vision sometimes and visual tessellations of patterns or textures. I've never had psychedelic open eye visuals while not on a psychedelic.