[randomdrake]

There's a lot out there, including products that are very similar to this one[1]. The category you may be looking to Google is "assistive technology."[2]

For products for the blind, the most comprehensive list I could find was from the American Foundation for the Blind:

http://www.afb.org/ProdBrowseTaskResults.aspx?TaskID=274&Spe...

[1] - http://imerciv.com

[2] - https://en.wikipedia.org/wiki/Assistive_technology