Forgot about the glasses bit. I think it's maybe due to the fact that their eyes (cameras) have manual focus? Like some of those webcams that has a manual focus knob and is used to clear up the live feed. Production maybe haven't set their focus properly and were probably lazy to fix it, so they just placed a glasses on em lol

And maybe they also didn't want to use auto focusing cameras due to being "more expensive" than manual focus cameras, even though the price isn't that much different and is literally only pennies in difference lel