If it works by constricting the pupil I guess it's more like it's expanding the "depth of field". So you can't "over-correct" except in the sense that you will

If it works by constricting the pupil I guess it's more like it's expanding the "depth of field". So you can't "over-correct" except in the sense that you will eventually run out of light. I don't really understand eyes or optics though, I'm just guessing based on my layman's understanding of focussing a camera, so take this with a pinch of salt!