Myopia of 900 degrees is a high degree of myopia, which may cause blindness if there are serious complications, such as macular cleft, macular hemorrhage, retinal fissure or retinal detachment, which can cause irreversible damage to the retina and make it difficult to restore the vision to normal even after surgery. To avoid this, for 900 degree myopia, you must pay attention to maintain reasonable eye habits in order to slow down the development of myopia as much as possible. Reduce strenuous exercise in normal times to prevent serious complications from occurring. It is important to have regular fundus examinations to detect the problem early and treat it early, only then can the damage be minimized.