I am glad I found this thread, old as it may be. We recently adopted a blue-eyed white cat, not Siamese, short hair, not sure of a breed at all, but I suspect he's deaf, though he seems to be almost fearless. Maybe not fully deaf because I have noticed him responding to high pitched noise, but he doesn't respond at all to other noises that you would think would get him to at least turn in look in curiosity, like clapping of hands. He's also easy to sneak up on, even when you are not being quiet or trying to sneak up on him.
Thanks for the info!