I don't know how serious the situation is in other countries, which is about the people under 18 years who have got nearsighted. The percentages of nearsighted children and teenages in my country has been increasing rapidly in the past ten years as the smart phones were widely used. More and more reports have proved that the serious myopia problem is really related to the time children spent on their smart phones. Video games, live streaming and movies are the main parts of a chid's life, which is very different from their parents' childhood that was full of outdoor activities. Screen time reduces children's time of looking far away and enjoying the sunshines. The two activites are just the essentials to keep children's eyes growing on an healthy way. The chidren's prescriptions are really hard to control. It's an annoying problem which not only costs too much money ,but also makes children feel unfortable during the classtime. Fortunately, in recent years, govenment has made many policies to protect children to avoid being nearsighted in an early age. Meanwhile technology can also help children treat myopia, such as Red light. But how to effectively reduce children's online time is the key to solve the myopia problem.