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Check out this blind man using echolocation technology to ride a bike.
People with vision issues can also use apps where real people or an AI can see on their behalf and guide them.
Check out this crowdfunding campaign for a blind assistance helmet.
https://www.kickstarter.com/projects/blindhelmet/blind-assistance-helmet
I came across this sonar wrist band device!
https://www.palmervision.com/product/sunu-band/
This smart walking cane uses sonar feedback to help blind people navigate their surroundings.
Check out this teen who created a assistive device for visually impaired people that uses GPS and ultrasonic technologies.
https://www.good.is/articles/eighteen-year-old-kid-helps-the-blind-in-a-big-way