>>21812288seems to vary
for one, lights seem to burn into my vision a lot more than usual, sometimes i'll see phosphenes which can take all different sorts of shapes, and when it gets particularly bad it'll briefly cover most of the things im looking at, usually looking like flashing dots everywhere
earlier while hiking with some friends i pushed myself too hard and it felt like i had turned up the contrast setting on a game where bright things looked brighter and shadows seemed to pop out more and be darker, and i was also seeing "stars" which means seeimg fast moving particles of light, usually a pretty bad sign that comes with confusion and collapse but in my case i was just a bit exhausted and felt pretty aware of everything, also sometimes you'll see them when you sneeze
more than anything, i think my visual system is just kinda cooked