The Internet not only brings infinite convenience to mankind, but also brings a lot of troubles to people. For families with children, there are great temptations from both positive and negative aspects of network information. Children's long time on the Internet will affect their eyesight and learning. What makes parents worry more is the side effects of pornography, games, violence and so on from the Internet. 
In order to protect children's eyesight, children's online time should be limited
 parents should guide and restrict their children on the Internet.