The Deaf (capital D) community has its own special language. There's a lot of culture that comes out of that. On the other hand, the blind community has the same languages as the rest of us.
Plus in a motor vehicle driver's world, blindness presents a much more serious problem for mobility, which makes 'the blind community' more diffuse. Blind people are, unfortunately, often relatively socially isolated.
I do suppose that makes a lot of sense. I imagine it's twofold, too: having your own language probably instills a sense of community, which is heightened by the isolation one feels from being so disconnected from so many other communities (including society at large)
