Keep a Distance by WeiQichong from china

The number of myopic, especially of the ones at young ages, has soared in recent years. Researches have shown that myopia at young ages is usually caused by the failure of keeping adequate distance between the book and the eyes when writing and reading.
With induction technology, “Keep a Distance” can protect children’s eyes against myopia by inducing the distance between the eyes and the book: when their distance is shorter than 30cm, the device will remind you with warning words and patterns; when it is longer than 30cm, they disappear.