Refractive error, cataract, open-angle glaucoma and other factors can cause blurring of the left eye, which can be treated with glasses, medication, surgery and laser. 1. Refractive error: suitable concave or convex lenses can be worn. Patients with myopia can choose appropriate refractive surgery for treatment under the guidance of doctors. 2. Cataract:Early cataract can be treated with some medications, such as amino acids, pinoxin, glutathione, etc. It is recommended to use them under the guidance of doctors. If the patient is not satisfied with the current visual status or the doctor evaluates that surgical treatment can improve the visual status, surgical treatment can be chosen. Common surgical methods include intracapsular cataract extraction, extracapsular cataract extraction and IOL implantation. 3. Open-angle glaucoma: It can be treated with medicines such as Trichostatin and Timolol under doctor’s guidance. If the effect of drug treatment is not good, surgery can be considered. Patients who are not well treated with medication, cannot be treated with medication and do not want to be treated with surgery can consider laser treatment. Blurring of the left eye, it is recommended to go to the hospital in time.