I bet he can see
i gotta agree with this a very crude and anecdotal bit of evidence you can try is while watching the tv (ideally in the dark) lie down on your sofa and then clsoe your eyes, after a little while i find the volume seems to go up noticeably.
Shame he can't read these posts
Good for him though.
Guess you've never heard of JAWS then.
Does he have some kind of hearing aid?