I also take Lexapro 10 mg a day. I take Xanax as well. My doc told me the Xanax would cause my pupils to be dilated and they really are. At night, other's headlights have a haze around them. I understand the "imprint" thing too - I have also noticed that if I am sitting staring at the wall, my eyes move with my heart beat. Strange. I think it is all side effects. I have been on the Xanax for about 4 months now and the Lexapro about 2....it helps, so I'll take it!