the auto-dilator

the light switch for my garage is inside my house so when i turn it on, theoretically nothing happens. Its weird, you usually never notice this and people say you cant feel it when it happens, but i swear i can feel my eyes dilate when i flip that switch. it feels like when someone sets off a camera flash in your eyes in a dark room, you can almost feel them expand. its such a strange feeling to have your eyes dilate themselves as a reflex.