Is it bad for your eyesight if you use your phone for a long time?

pu1. Of course it's not good. Cell phones are often used for a long time, but it's not good for your eyes if you focus on the small screen for a long time

2017-12-07

OK

pu2. Looking at small letters or screens for a long time is not good for your eyesight because it causes eye fatigue quickly. Plus, the cell phone is quite bright, so it's more difficult for your eyes

2017-12-07

OK