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I'm only aware of wildly experimental implants providing like 200 dots of light. They aren't by any means a deployed medical technology.

This sort of system could provide audio cues in any environment. That's already a big step up from 'most environments'.

Combined with something like Tactus [1] and the environment can be represented in a tactile 3d map [2].

Well I'd imagine using computer vision that can identify door handles, elevator buttons (even so far as reading out the numbers on the display).