Since drug therapy for cataracts has so far failed to effectively treat cataracts, surgical treatment is still the main means of treating senile cataracts. With the continuous development of cataract surgery instruments and techniques and the improvement of people’s quality of life, the indications for cataract surgery have been relaxed. In recent years, small incision ultrasound-emulsification cataract extraction has been widely carried out nationwide, making cataract surgery time significantly shorter. Generally speaking, when cataract causes vision loss and already affects daily work and life, surgery can be performed. For example, in Europe and the United States, cataract surgery is required when the corrected visual acuity is below 0.7, as the vision is above 0.7 to drive a car. In China, the situation is more complicated and depends on the patient’s occupation, the type of cataract, and the surgeon’s surgical skills. The more common standard is that surgery should be considered when the corrected visual acuity reaches 0.3~0.4 due to cataract influence, instead of having to wait for the cataract to grow mature before performing ultrasonic emulsification surgery, because the core part of the cataract is soft at this time and the surgery rate of ultrasonic emulsification is high, otherwise waiting for the cataract to grow mature before performing ultrasonic emulsification surgery will bring difficulty and increase the risk of surgery; it is also prone to complications.