I guess that the gentleman was completely blind, and the lady partially blind, as she was guiding him and helped him buy a ticket. What was very pleasant was that both were cheerful and happy.
The scene was so inspiring. Dressed in ordinary clothes, two blind individuals were travelling on their own and were happy.
This reminds me of a an irregular instance in Delhi. I used to travel via buses in Delhi as well. At times, I used to see her get into the bus, aided by somebody. And she used to travel to work in the bus.
I used to feel so happy and inspired whenever I used to see her.