Blurred vision may be caused by visual fatigue, refractive error, glaucoma, cataract, optic nerve damage, etc. 1. Visual fatigue: Long time close reading, or long time looking at electronic devices, resulting in visual fatigue, blurred eyes. It can be relieved by closing the eyes or looking into the distance and paying attention to the daily eye use time. 2. Refractive error: Refractive error will appear myopia, hyperopia, astigmatism, and blurred vision. You need to go to the hospital for vision examination and wear glasses if necessary. 3. Glaucoma: In addition to blurred vision, patients are accompanied by headache, eye pain and other symptoms, which may be caused by high intraocular pressure, consider whether it is glaucoma. Seek medical attention and have the intraocular pressure tested. 4. Cataracts: Cataracts mostly occur in the elderly. Due to ageing, a white fog appears when looking at things, which is diagnosed as cataract. Surgery is recommended depending on the patient’s condition. 5. Optic nerve damage: The optic nerve in the eye is damaged for various reasons, resulting in blurred vision, which needs to be treated according to the cause of optic nerve damage. The specific causes of blurred vision need to be examined and treated under the guidance of a doctor.