Though some sunglasses are transparent to certain cameras, and others like vaydr claim to have an extra layer beyond ir blocking (but don’t explain how it works, really, bc “proprietary”)

Zenni claims to have a coating that blocks facial recognition even on regular non-tinted glasses. I sprung for the option when I got new glasses, but I haven’t tried to test if it actually works yet. (Obviously, it won’t do anything on systems that work only in the visible spectrum, but better than nothing?)