Did DXM once, took me a week to be completely sober but after that everything normalized. A month after that visual symptoms started on one of my eyes (tracers, visual noise, strange color perception). I didn't notice it at first, only when I smoked weed. I went to the hospital after that because I have a history of eye problems and I didn't even know about hppd back then. Of course they found nothing whatsoever, they still put me on medical tho which actually helped with the symptoms yet a week after I stopped taking the meds (I was told to) different symptoms started to occur on both of my eyes (halos around lights, rays through the lights taking up half of my vision). It's been like that for 8 months, with no change whatsoever.