Daniel Kish Uses Sound To See

Daniel Kish had both eyes removed at the age of 13 months after being diagnosed with retinoblastoma, an aggressive form of cancer. He didn't let that slow him down. Though blind he can mountain bike, navigate the wilderness alone and recognize a building as far away as 1,000 feet. Kish is president of a nonprofit organization called World Access for the Blind. World Access offers training on how to interact with one’s environment, using echolocation as a primary tool. Kish hears echos and interprets their meaning to visualize objects, similar to the way bats, beluga whales and dolphins  "see" objects.
He can hear the variation between a wall and a bush and a chain-link fence. Bounce a tennis ball off a wall, Kish says, then off a bush. Different response. So too with sound. Given a bit of time, he can echolocate something as small as a golf ball. Sometimes, in a parking garage, he can echolocate the exit faster than a sighted person can find it.

Link - Via Book of Joe

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From what I understand about echolocation in humans is that it doesn't suffice to detect holes in the ground. So if you follow a blind man who can echolocate, you are still likely to fall into a pit.
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