Why is it that cataract surgery is not performed until you can’t see? At that time, cataract surgery was performed by making a large incision and removing the entire cloudy lens (cataract), and then the eye was missing a lens (like a camera missing a lens). In such a case, of course, the patient has to be completely blind before he or she can feel a slight improvement in vision after surgery. Let’s compare how cataract surgery is done nowadays. After more than 20 years of development and the introduction of advanced technology and equipment, we have now made micro-incision ultrasound emulsification surgery and can also implant an IOL during the surgery, so the eyes are fully equipped and have a brand new lens to see clearly. Even better news is that in recent years, femtosecond laser-assisted cataract surgery has been developed, making the surgery more precise and providing better post-operative outcomes. There are still people who are afraid of how long the IOLs they put in will last and whether they should be taken out and replaced. Some patients may ask, “Can I just have the cataract removed without an IOL? IOLs are artificial products made of biocompatible materials with different diopters. The IOLs provided in hospitals are approved by the National Drug and Device Administration, qualified by various required testing methods, and have undergone simulated 30 years of aging tests to show constant performance. Therefore, generally speaking, the implantation in the eye is for life and does not need to be removed and replaced. Patients also do not have to be concerned, the IOL still has to be implanted in the middle of the surgery. If the IOL is not implanted, won’t it be a regression to the state of 30 years ago? So, did you know? Nowadays, with advanced science and technology, cataracts should not wait until you can’t see before surgery. When you feel your eyes are blurry, you should see a doctor. If you are sure that the cataract is causing the vision damage and it is obviously affecting the quality of work and life, you should consider surgery next.