Can blind people visualise?

[Caius]

As you suggest, I think the reason people visualise things is because sight is the primary sense that humans use to orientate in the world. (which is why I'd rather be deaf than blind, for example)

Perhaps the blind has a more tactile memory of items?

[Caius]

I've met a few blind people who wanted to touch my face. Perhaps it's easier to remember people that way, rather than by voice recognition.