All causes such as aging, genetics, local nutritional disorders, immune and metabolic abnormalities, trauma, poisoning, radiation, etc. can cause disorders of lens metabolism, resulting in clouding of the lens proteins, called cataracts. Cataracts are most often seen in people over 40 years of age and their incidence increases with age. Some early cataracts may slow down and improve their vision after medication, but this is not necessarily the result of medication, because the early progression of cataracts to maturity is a long process, and it may stop at a certain stage of development without seriously affecting vision. In some patients with intermediate cataracts, vision and lens clouding fail to improve with medication. In near-mature cataracts, drug treatment is even less practical. Currently, the commonly used drugs in clinical practice are eye drops or oral Chinese and Western medicines. Cataract ultrasound emulsification is a new type of cataract surgery developed at home and abroad in recent years. Ultrasound is used to crush the nucleus of the lens to make it celiac, and then aspirate it together with the cortex, and the posterior capsule of the lens is preserved after the operation. If an aging cataract has developed to a visual acuity of less than 0.3, or if the degree and location of the cataract significantly affect or interfere with visual function and the patient wishes to have good visual quality, ultrasonic cataract extraction surgery can be performed. Its advantages are small incision, less tissue damage, short operation time and fast vision recovery.