I worked for a company that built products for the blind.
I did a quick search on the optacon, a product I did some work with, and came up with this site of a user:
http://www.blindcanadians.ca/publications/cbm/6/support-opta...
The company I worked for became "freedon Scientific". THis company makes a variety of enabling technology.
I work with a couple of pioneers in the industry, I would be glad to either check out your idea, or pass it on to my friends.