People Often Look At Me, Especially Kids. Although I Have Harmful Light

Riddle: People often look at me, especially kids. Although I have harmful light, they still look at me until they are blind. I was not used by kids when they are in school or when they do not get good results for their exams. What am I?

Answer: A tablet.

Source: https://www.riddles.com/2566

People often look at me, especially kids. Although I have harmful light, they still look at me until they are blind. I was not used by kids when they are in school or when they do not get good results for their exams. What am I? — People often look at me, especially kids. Although I have harmful light by NEO JIA QI v1.

Riddle: People often look at me, especially kids. Although I have harmful light, they still look at me until they are blind. I was not used by kids when they are in school or when they do not get good results for their exams. What am I? Answer: A tablet. — by NEO JIA QI v2.