In the past, the principle of cataract surgery was to wait for the cataract to “mature” before doing the surgery, which was determined by the surgical method. In the early days of cataract surgery in China, the surgical method used was small-incision extracapsular extraction combined with cataract surgery, which required hardening of the cataract nucleus in order to remove the whole cataract at one time. This type of surgery determines that the later the cataract is done, the better it is done. However, this is no longer the case, and with advances in technology, the timing of cataract surgery varies from person to person. This is because ultrasonic emulsification surgery is now commonly used in the world to treat cataracts, and this type of surgery is the most effective, proven, and advanced treatment available. Through an incision of only 3.2mm or even smaller, the cloudy lens nucleus is crushed into a cushion and suctioned out, and then an artificial lens is implanted. This type of surgery has the advantages of quicker post-operative vision recovery and smaller incisions, and also dictates that cataract surgery is easier to perform the earlier it is done, the exact opposite of the small-incision extracapsular surgeries that have been used in the past. Therefore, as long as the cataract affects the patient’s normal life and work, it can be operated, and not wait until the cataract is “ripe”.