Some years ago my wife and I were visiting a hotel which catered specially for people with guide dogs; was writing a feature article for other hotel owners about what you need to do for these folks. Not wishing to upset or offended anyone, checked the correct, accepted language to use – “visually impaired” not ever “blind”. At breakfast on first morning, a very elegant, charming lady (with equally charming dog) leaned over to us and said, “I say, you’re not blind are you?”