Sighted person here. I work in vocational rehabilitation with some people who are blind or low vision. I have never suggested to a client that he/she wear dark glasses, but am thinking about it for one of my clients. He wants to become a massage therapist (I know, it is a cliche, but it really is what he wants) and I think he might get more clients if he made some slight changes to his appearance, including wearing dark glasses. People are superficial and often nervous about massage to begin with, and I think most would be fine with working with a blind person as long as they aren't put off by seeing glass eyes or empty sockets.