I don't know how much LSD you did or what your body weight was or anything else that might be chemically relevant. But I would be deeply surprised by an individ

I don't know how much LSD you did or what your body weight was or anything else that might be chemically relevant. But I would be deeply surprised by an individual being immune to the closed eye hallucinations. When you look at a lightbulb for a moment and then close your eyes, do you get the after image? The "closed eye hallucinations" are just that normal after image chopped up in frequency space. LSD exposes the fact that a lot of what the brain does can be understood in terms of analog signal processing. The most reliable way to get a high quality viewing of the crystal patterns is with TV static. Baring that, any randomized constant texture such as a carpet will suffice. The reason is because random noise evenly fills up the entire spectrum in frequency space, so whatever frequencies are cut, de-phased, or otherwise affectef are guaranteed to be present in an image of pure noise. Another reliable glitch is that all lines below a certain thickness will tend to wobble or drift in and out of visibility. Again, construct a line as a really thin gaussian wave packet and see what happens when the high frequency terms pick up phase drift. LSD hallucinations have nothing to do with aphantasia.