They look at you with such a blank stare. You could tell there was a working functioning person in that head at one point, but now just a shell of their former self.
And when they look at you, it’s like they know that you know that they are lost and gone.
They are not grounded in reality. Without any tether. Only thing that is constant in their life is the babble on the television.
Sad. Many such cases.
It is easier to see when you are only around them occasionally.