Blurred vision may be caused by physiological factors, eye diseases, brain diseases, low blood pressure, low blood sugar and other factors. 1. Physiological factors: Excessive eye use or excessive hunger can lead to eye blurring, which may be accompanied by dry eyes, soreness and other discomforts. After eliminating the triggers, patients can improve their vision and relieve discomfort. 2. Eye diseases: Keratitis, glaucoma, cataract and other eye diseases may cause patients to have blurred vision, that is, blurring of vision, which may be accompanied by eye pain, and in severe cases, even blindness. In addition, patients with presbyopia may experience blurred vision due to decreased elasticity of the lens and decreased regulation of the eyes. 3. Brain diseases: patients with severe presbyopia may also be associated with brain lesions, such as brain tumors, cerebral atherosclerosis, and may be accompanied by headache, dizziness, nausea, vomiting and other uncomfortable symptoms. 4. Hypotension or hypoglycemia: when hypotension or hypoglycemia strikes, patients may also have symptoms of blurred vision, accompanied by dizziness, pallor, hand tremor and other symptoms. It is recommended that patients with obvious symptoms of blurred vision consult a doctor promptly to assess their condition and follow the doctor’s instructions for treatment.