Ten-year-old myopia 400 degrees, if all are true myopia, it is more serious, need to seek timely medical correction, and improve eye habits. Ten-year-old myopia 400 degrees, is already moderate myopia, it is recommended to take the child for eye function examination, wear the appropriate degree of frame glasses to correct. At the same time, it is necessary to develop correct eye habits, avoiding prolonged close-distance use of the eyes, so as to avoid rapid progression of myopia. If conditions allow, you can also choose corneal contact lenses to correct myopia, to a certain extent, but also slow down the progression of myopia. Parents are advised to take their children to regular eye hospitals for correction under the advice of professional doctors, and to take early intervention measures when the myopia deepens too fast.