Designer Jin Woo Han proposes a design for a walking stick for the blind that has a proximity sensor and a built-in vibrator that relates to the user how far objects are. This is just a design proposal, but the idea is not far fetched as the various technology components already exist in production.
Product page: Wand for Blind…
(hat tip: Gizmodo)
Design Concept: Wireless Walking Stick for Blind
March 10th, 2008 
Medgadget Editors Rehab