I used to wonder if A's had tunnel vision, til one chap told me it was bottle vision for an A and tunnel vision for the missus.....he admitted he could not see past the bottle at his lips. The more I think on it, the truer that idea seems to get.
The drinker is focused on the bottle he's drinking from, seeing nothing past it.
The "Missus", (GF, wife) is focused on his drinking and it's effects on her and family.
Makes sense doesn't it?
God bless