Andrew Leland on Assistive Tech for the Blind
Cars That Think
AUGUST 1, 2023
Leland is gradually losing his vision due to a congenital condition called retinitis pigmentosa , which slowly kills off the rods and cones that are the eyes’ light receptors. They used a light-sensitive material—selenium—to create a device in the twenties called the optophone. The technique was known as musical print.
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