You might be interested in this - A company has created some audio walking guides to Kabukicho and Akihabara:
http://tokyorealtime.com/

Those two neighborhoods are a bit odd - Most of Kabukicho is a red light district. It's one of the few places in Japan where you can easily be the victim of a crime and you'll certainly be pestered by touts who want to entice you into a bar where you're likely to be fleeced, so I can't really recommend that you hang around there if your eyesight is damaged and you're not quick on your feet. Akihabara is probably a safer choice - it has a mix of electronics stores and "geek culture".

It looks like this company is planning to produce audio guides for other neighborhoods, but so far it's just those two.