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People suffered from night blindness cannot see anything in the darkness. Since they have to turn on the light in the dark,it is hard for them to get up at midnight to drink water without affecting the partner's sleep.
NightCAT is a luminous coaster which can help people suffered from night blindness. It emits a weak light which does not harm sleep, and at the same time helps patients with night blindness to locate the cup and to know how much water in the cup.
Wang Weiyu, Sun Chen'guang