u/Good-Switch-8025

I don't know if this is possible I don't do a lot of complex thing, but I figured I'd come here to ask. My friend always has their avatars they make wear glasses, and they expressed wanting the ability for someone to take the glasses off them, applying a blurry effect to their vision, but they don't even know where to start on that. Is that possible? How would it be done, if so?