That there is the old lazy eye.
I used to have a hockey coach who had a hard core lazy eye... on more than one occasion he'd just start talking to 1 of us in a group, and afterwards we'd be like 'who the fuck was he talking to there?' If he didn't identify you by name, it could take 20-30 seconds to figure it out.
For example, one eye would be looking at my buddy Lip, and the other seemed to be looking at Poff, and I might be standing between the two of them... and we just wouldn't have a clue.
I miss those days...