It is necessary to have reasonable eye habits in order to study and prevent the onset of myopia. In the United States, there are 20/20/20 principles. Keep reading for more than 20 minutes. After 20 minutes, watch 20 feet away. Look at the time for at least 20 seconds. This is the third 20 of the US prevention and control of myopia.
There are "three ones" in our country. The chest must be punched from the table. The eyes must be one foot away from the book, and the eyes and the nose should be one inch away from the book.