I couldn't agree more with David Newnham. My youngest son was 21 when he lost his sight trying to stop three men beating up a younger man. He gets fed up with the expression "visibly impaired". He feels it is in his best interest for people to undestand that he cannot see. The word "blind" makes it clear what my son's problem is and people immediately realise what help he needs.
Labels do not matter so long as they are self-explanatory.
Sylvie Gallimore Horfield, Bristol