Vale invests in glasses that measure the level of fatigue of workers in mines

Device analyzes eyelid movement speed 500 times per second to prevent accidents

14th November 2018

https://www1.folha.uol.com.br/tv/mercado/2018/11/vale-investe-em-oculos-que-medem-nivel-de-cansaco-de-trabalhadores-em-minas.shtml