You wouldn't have all those sockets scattered like that for medical reasons, most of them are spaced for TV/entertainment. There's another 4 external power sockets on the outside of the conservatory equally spaced out and another on the front of the house. If it was for visually impaired you'd have a greater contrast between surfaces and doorways, using spots randomly on walls can make things worse. This is just an example of someone who wanted everything when the house was extended possibly around 12 years ago and to be "better" than the neighbours.