Helping the Blind See
Blind children instinctively click their tongues and listen to the echoes. From this, like bats, they can get an idea where the walls are near them. Skilled clickers can see as well as sighted humans can with peripheral vision. Unfortunately, parents and teachers hush the children because the clicking annoys others.
I suggest a bit of technology to send out ultrasonic clicks, the way dolphins do, and convert the echoes back into human sonic range. Ideally, the unit would be compact enough to fit in the ear and not interfere with ordinary hearing. Back in 1979 I worked with Dr. John Lilly doing something similar with dolphins, using a microwave-sized SD-350 FFT (Fast Fourier Transform) analyser. But today it might be possible to miniaturise.~ Roedy (1948-02-04 age:70)