Also, don't do what a former boss of mine did with two separate blind colleagues: which was to SCREAM and whitter loudly every time they went near steps (that they otherwise traversed 2 to 4 times each working day for months). The screaming and whittering about steps was a bigger danger than the damned steps, and it was embarrassing for the blind colleagues and honestly cringeworthy to witness.

If you want to be helpful, ask the blind person discreetly and listen (I mean listen) to the reply.