Ive got hppd...sounds like some of you have it aswell =)
its not the same as seeing the bright outlines after looking into a lamp..its similar but much more intence...i see the visual snow always and its neverending, you just gotta get used to it, its alot "worse" in a dark room or if you smoke some herb or take other substances..and its very hard to ignore.
alot of colour confusion..white walls will change from red to purple green and blue, objects appear to move around alot more than they really should
its quite enjoyable imo..
/peeniwalli