'Shoes with sight' for blind

The researchers at Hong Kong Polytechnic University say the glasses and shoes, which have a built-in computer, can detect objects within close proximity through echo location then send a vibrating warning signal to the wearer.

"Ultrasonic waves are sent out and when they bounce back they are interpreted by a receiver.

"Once an obstacle is detected the shoe will vibrate, perhaps increasing in intensity as the obstacle gets closer," Research Institute of Innovative Products and Technologies director Wallace Leung Woon-fong was quoted as telling the Sunday Morning Post.