聴ちょう光こう器き

noun

optophone

A device that converts light into sound, historically used as a reading aid for the blind. Technical term; rarely encountered outside historical or specialized contexts.

• 聴ちょう光こう器きは、光ひかりを音おとに変へん換かんする装そう置ちです。

  An optophone is a device that converts light into sound.