Vitreous clouding is usually a rare cause of blindness, and even when it does occur, it is mostly a result of untreated pathologic vitreous clouding that occurs later in the course of the disease, usually over a period of time that varies from six months to five to six years. However, the usual vitreous clouding is mainly caused by physiologic vitreous degeneration, which is mainly related to age as well as myopia. Usually this condition does not affect vision and is painless, so clinical intervention is not indicated. And there is no good way to improve vitreous clouding, so it can be observed and followed up, and will not lead to blindness. However, pathologic vitreous clouding may be caused by hemorrhage, inflammation, or immune response, which requires active treatment, sometimes even surgery. If the disease is allowed to develop without surgery, it may cause blindness.