Cataract is one of the most common and frequent diseases. According to statistics, the incidence of cataracts among people aged 60 to 80 years or older in China is almost 80%, and the incidence of cataracts among people aged 90 years or older is over 90%, which brings inconvenience to many patients. Cataracts have become the leading cause of blindness worldwide, so timely and effective treatment is essential. There is no effective drug to control and cure cataracts. Treatment is still mainly surgical, but with the continuous development of surgical techniques and equipment, new surgical methods are safe, have fewer complications and are more effective. The timing of surgery has also changed significantly compared to the past. The best type of cataract surgery available today is cataract ultrasound phacoemulsification. Through a very small incision, the cloudy lens is broken up and sucked out through a high-frequency mechanical vibration, which causes less damage to the intraocular tissues and less corneal astigmatism. Do not wait until the cataract is mature or completely invisible to have surgery. In the process of cataract development, the lens is constantly absorbing water, expanding and swelling, and in the process of expansion and swelling, it will cause the anterior chamber angle to become shallow. Glaucoma. This condition is very common in our clinic. Every year, there are several cases of cataracts that cause glaucoma due to time delay.