Although bats can see, many species have evolved an unusual way to fly and hunt in the dark—echolocation. To do so, they emit ultrasonic sound waves that bounce off objects and navigate using the resulting echoes. Can this technique be used by people without sight? An innovative start-up in Kazakhstan, Sezual, has developed echolocation for human beings, with support from the World Bank. Sezual’s device, with special training, helps blind people “see” objects in three dimensions within a radius of 15 meters. Worn around the neck, it emits a high-pulse click that reflects off surrounding objects, providing information on their distance and shape that can be processed in 3D in the visual cortex of the user’s brain. It can even identify what material the object is made from. The device allows the visually impaired to navigate space freely, to work, travel, and live a full life.
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