My vet does this. He’ll be working on the dog, and he’ll look up to tell me something and he’ll close his eyes and start talking. If he does try to open them, it’s almost like a battle.

I have an acquaintance who does the same thing. They only do it when they are the ones talking, not when you are talking to them.
It’s a little disconcerting when someone is talking to you and their eyes are squeezed shut.

Is is a neurological thing? A psychological thing?