The current many researchers commented that determine the cause of health disease from smartphone. First, the screen of mobile-phone has Blue light. Blue light can make negative effect or damage to human eyes. For example, people have eyestrain and headache when people used smartphone. Second, people like to play smartphone during the movement .To illustrate, people like to play smartphone on the vehicle. Finally, people like to play Smartphone in inadequate lighting room. For example, the children would like to play smartphone before sleep during room does not have adequate light.