Do you tend to fall asleep at your desk a lot? Or behind the wheel on those long drives home from a day on the golf course? These glasses, called the Mydo Bruru ("bururu" is the noise of shaking) have a tiny battery-operated motor attached to the ear hook that vibrates when tilted below a certain angle, making sure you don't dose off. It's a big hit among sleepy businessmen. Some people buy it even though they don't need glasses for vision purposes.
Product page (Japanese)

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