The cause of blurred eyes should be distinguished before choosing medication. Most blurred vision is caused by lesions of the refractive interstitium (e.g., cornea, lens, vitreous), retina, and optic nerve. In general, blurred vision caused by keratitis, iritis, visual fatigue, and dry eye can be treated with eye drops, while lesions of the lens, vitreous, and retina are mostly treated with oral medications or surgery. If blurred vision is accompanied by eye redness, eye pain, photophobia and tearing, it is considered to be caused by eye inflammation. For example, keratitis can be treated with eye drops according to the cause of infection, such as anti-bacterial eye drops, anti-viral eye drops, anti-fungal eye drops or hormonal eye drops; if it is caused by iritis, anti-inflammatory eye drops, hormonal eye drops and dilating eye drops can be chosen. If in addition to eye redness and eye pain there is also eye distention, headache, nausea and vomiting, consider it caused by high eye pressure, such as acute attack of glaucoma, choose eye drops to lower eye pressure, pupil reduction eye drops; such as glaucoma ciliary syndrome can choose eye drops to lower eye pressure, hormone anti-inflammatory eye drops. If it occurs after a long period of close eye use, consider it to be caused by visual fatigue or dry eye, you can choose eye drops to moisten the eyes and relieve visual fatigue. If painless progressive blurred vision in the elderly is considered to be caused by cataracts, mild cataracts can be left untreated or eye drops to slow down the development of cataracts can be chosen, while surgery should be chosen for moderate cataracts or above. Surgical treatment. Blurred eyes may contain many causes and the most appropriate treatment should be chosen according to the different causes.