I have been on many anti-depressants in the past, and the medications I am currently on are Wellbutrin, Vyvanse, Remeron, Clonidine, and Daysee. I had abused Vyvanse and Xanax in the past unfortunately, and I can remember while I was still abusing, my right pupil would always be bigger than my left one, and I could stay in the same lighting, without moving a centimeter, and my pupils would be moving in and out for no apparent reason. The right more so than the left. I haven't abused any medications since April (2013) and I still notice them doing this when my pupils are extremely dilated - which is something I also don't understand - on a regular basis. I was curious as to why this could be happening?