The lens of the human eye is like a transparent biconvex lens through which light converges on the retina. When the lens is cloudy, the passage of light will be affected and the person will not be able to see clearly, which is when the doctor says that the person has cataracts. Cataracts are categorized into several types according to their causes, among which senile cataracts are the most common, the causes include nutrition, metabolism, endocrine changes, ultraviolet irradiation, environmental factors, etc., and the prevention should pay attention to the nutrition and protection according to the situation. Early treatment and slowing down of the development of cataract can be treated with medication, such as: 1, auxiliary nutritional drugs, such as vitamin C, B, E, etc. 2.Drugs related to quinone doctrine, such as Cathelin, Leucovorin, and Cure Barrier Ning. 3, Antioxidant damage drugs such as glutathione. Traditional Chinese medicine is effective in improving vision in some patients. After cataract occurs, the refractive index of the crystal is changed, and often myopia or hyperopia occurs at the same time. Therefore, wearing glasses in the early stage can sometimes improve visual acuity. For the obvious symptoms should be surgical treatment, rather than wait until “mature”, because in the process of waiting for the visual symptoms to the work and life brought inconvenience, and once the occurrence of other eye diseases, especially the fundus disease is not easy to be detected, but also can not be treated in a timely manner. Surgery involves removing the cataract under a surgical microscope and implanting an artificial lens, which is like an “intraocular lens” to replace the removed cloudy lens. Ultrasonic Lens Emulsification is a very advanced cataract surgery that is best suited for patients with immature cataracts and those who do not have a hard lens nucleus. The axial length of the eye is measured by ultrasound A, and combined with the corneal refractive error, the number of IOLs required is calculated, allowing the surgery to be performed at or close to the desired preoperative refractive state. The biggest advantage of the ultrasonic emulsification surgery is that the incision is short, and the cataract can be removed through an incision of less than 3.5mm. Implanting a foldable IOL through this small incision not only reduces the damage to the cornea from the surgery, reduces astigmatism caused by the incision, and speeds up the recovery, but also reduces a series of complications from the incision. At the same time, it can reduce the damage to the iris and cornea when delivering the lens nucleus and other disadvantages. The incision of ultrasonic emulsification surgery has high stability, shortens the surgical hospitalization time and facilitates outpatient cataract surgery. The indications for this surgery are wider. It does not require bed rest after surgery, does not restrict the patient’s free activities, has less astigmatism after surgery, and recovers quickly.