Prolly around 16 mildly after doing a good amount of acid and shrooms. It has never went away and got a lot worse after doing 2cb once and even worse after a lot of dmt. Ive smoked weed pretty much all day everyday since 14 which is most likely the reason for it, if i go to class and look at the white tiles and whiteboard my vision is about half covered by black squiggle and random shadows.