Posterior cataract is a relatively rare complication after cataract surgery, which is more common in young people. It is an outpatient operation, and the cost of surgery is relatively low, usually about 500 yuan without hospitalization. After surgery, antibiotic eye drops and IOP lowering drugs should be used routinely to prevent the possibility of secondary glaucoma or infection after surgery. The commonly used drugs are prapirofen eye drops and carteolol hydrochloride eye drops, which are usually used for 3-5 days, and if they completely return to normal after 1 week, they will not affect normal life and do not need to continue using drugs. Therefore, if your vision decreases after cataract surgery, you need to go to the hospital to check if there is any possibility of posterior cataract.