I learned I have this ability a couple months ago. Ive recently gotten a bit better at it. Ive been sober for over 5 months, so it has nothing to do with drug use. It might have something to do with the withdrawals I went through, because I constantly had huge pupils during immediate withdrawals, and I might have just permanently fucked up my brain. But seriously, I can't even explain how I do it, but I can enlarge/constrict my pupils on command. Its impossible to put in words how, but when I dilate them I literally feel like im heavy as hell and I get vertigo. Anyone else have this ability, or even heard of it before? I can't find any real info on it past a stupid wiki-how article, and some ways to do it through light tricks.