Eye fatigue, refractive error, presbyopia, glaucoma, cataract and many other causes can cause blurred eyes and vision, the common ones are as follows: 1. Eye fatigue: due to patients staying up late for a long time or playing with cell phones and watching computers for a long time, resulting in excessive eye fatigue, and then symptoms of blurred eyes and vision; it is recommended that patients pay attention to rest, and can also perform moderate massage or look into the distance to relieve symptoms; 2. Refractive error: It is due to the parallel light rays through the optical system of the eye are not accurately gathered on the retina, and then symptoms such as loss of vision, blurred vision and blurred eyesight occur. Treatment is mainly through corrective lenses or refractive surgery to focus light on the retina to improve symptoms; 3, presbyopia: is a physiological phenomenon, is due to ageing, the lens gradually aging, resulting in the regulating effect of decreasing, and then appearing blurred vision, blurred vision, dryness and other symptoms, the main treatment is to wear convex lenses to adjust vision; 4, glaucoma: is caused by pathologically high intraocular pressure It can be treated with drugs such as mannitol and brinzolamide under the guidance of doctors to control the eye pressure and relieve the symptoms. 5. Cataract: It is a degenerative change caused by a variety of reasons that lead to the decrease of the optical quality of the crystal, manifesting as blurred vision, visual field defects, diplopia, etc. After detailed examination, the patient needs to decide whether to perform medication or surgery according to his condition. In addition, other pathologies of the fundus or systemic diseases may also cause blurred vision, such as hypertension, diabetes, keratitis, amblyopia, and intraocular inflammation. Patients are advised to go to the hospital for detailed examination when they find blurred vision, to clarify the cause of the disease, and to develop a treatment plan according to the cause, and it is not recommended to use medication blindly to avoid delaying the disease.