Prosopagnosia sounds grim for sufferers. It must be both frightening and embarassing - I hadn't heard of this, only of people who have no 'mind's eye', and wonder if this is a related condition. Dominic Lawson wrote an article in which he said he can tell you that his wife is pretty, that she has red hair, and how tall she is, because this is in his memory bank, but cannot 'see' her in his mind's eye, or see anything else in his life for that matter. He can't imagine anything, because he can't see it - that too must be a strange concept to deal with.