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Two African inventors have independently produced devices designed to help blind people navigate. One of the devices could cost just US$150, raising the prospect of such technologies becoming a realistic option for blind people from poor backgrounds.

The first device, called GuideMe, was invented by Algerian Badreddine Zebbiche. The design, which is yet to be fully developed into a working product, uses three-dimensional sensors fitted to each side of the wearer’s shoes to detect obstacles. When this happens, the system sends a warning to a smartphone application, which gives the user instructions such as ‘turn left’ (Read more)