Myopia is related to a variety of factors, including genetic factors, environmental factors, and poor eye habits, and its correction is basically the same. Myopia of 400 degrees can be corrected by frame glasses, contact lenses and refractive surgery. 1. Frames: 400-degree myopia usually leads to loss of distance vision, and is also prone to visual fatigue. Patients can wear frames to correct their myopia and improve their vision. 2. Contact lenses: The principle of contact lens correction is basically the same as that of frames, which can correct myopia and improve vision. The difference between the two is that contact lenses are in direct contact with the cornea, which shortens the distance between the back of the lens and the apex of the cornea, and reduces the change in image magnification brought about by frames. 3. Refractive Surgery: Adult myopia patients who do not want to wear glasses can undergo refractive surgery, such as full femtosecond laser and IOL implantation, to correct myopia and improve their vision. After surgery, patients should pay attention to keep their eyes clean and avoid strenuous exercise. It is recommended that myopic patients consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.