harmful of computer

Last week, my sitter's son was punished because he did not go to school to play game. Since my sitter bought computer for her son to study,her son studies lazier and lazier. Because he uses computer to play game , not study. He can play game all day. So computers are really harmful for us.
Computers are one of the most harmful event for human for several season. First, computers make us become to be lazy, we do not want to think,study,research...Because every thing which we need,we can find on internet. Second,to use computer many hours a day make us feel tired,exhausted and our eyes become dimmer and dimmer and even we will be myopia. Third,using computers,many people can become to be crime,robber,... Example mane people like game on computers and even they are addicted game.so they can any thing to have money play game,they can play game all day without eating,sleeping...Many student do not go to school to play game. When they have no money ,they rob money their parent and other people and even they can kill person to steal money to play game.Many people have argued that computers have many helpful,example in study, they help us find out may important information.This may be true. This evidence does not mean that computers are harmful.It shows that we must know to use them helpfully.
we should use computers when we need,should not use them too may hours. Computers will make us have many difficulties when we use them without having aim.