Most blurred vision is due to lesions of the refractive interstitium (e.g., cornea, lens, vitreous), retina, and optic nerve. Different causes of blurred vision may be accompanied by other manifestations. In terms of urgency, if blurred vision is sudden, vascular disease (such as retinal artery blockage, retinal vein blockage, vitreous hemorrhage, ischemic optic neuropathy), retinal detachment, optic neuritis, etc.; if blurred vision is slow, corneal degeneration, cataract, primary open-angle glaucoma, chronic closed-angle glaucoma, age-related macular degeneration, diabetic retinopathy, etc. The cause. In terms of concomitant symptoms, if it is accompanied by eye redness, eye pain, photophobia and tearing, it is considered to be caused by eye inflammation, such as keratitis and iritis; if it is accompanied by eye swelling, headache, nausea and vomiting in addition to eye redness and eye pain, it is considered to be caused by high intraocular pressure, such as acute attack of closed-angle glaucoma; if it occurs after prolonged close eye use, it is considered to be caused by visual fatigue or dry eye; if it is clear in the near and blurred in the far If the blurred vision is caused by myopia; if the blurred vision is caused by presbyopia; if the painless progressive blurred vision is caused by cataract, which is the main cause of blurred vision in the elderly; if the blurred vision is accompanied by obscuration, it is caused by vitreous opacity, retinal detachment and optic neuropathy; if the blurred vision is accompanied by deformation, it is caused by macular degeneration; if the blurred vision is accompanied by If accompanied by severe headache and ejection vomiting, it is considered to be caused by cranial hypertension causing optic papilloedema, etc. Therefore, there are many causes of blurred vision, and most eye diseases can be manifested as blurred vision. If rest does not relieve the blurred vision, you should go to the hospital for eye examination in time to clarify the diagnosis and treat the cause.