For a long time, both doctors and patients have believed that cataracts should wait until they can’t see to have surgery and then they can see after surgery – this is the concept of sight restoration surgery. However, with the improvement of cataract surgery technology and IOL design, the concept of cataract surgery is undergoing a revolutionary change. Cataract surgery is no longer simply a surgery to restore sight by removing blindness and disability, but an intraocular refractive surgery that requires the greatest possible improvement of post-operative visual quality. In layman’s terms, cataract surgery is not only to see, but also to see well; to be able to see far and to see near; to have good vision not only in the daytime, but also at night. In order to adapt to the change from cataract surgery to intraocular refractive surgery, our hospital has introduced IOLs from many large foreign companies, which in general are divided into two categories: monofocal IOLs and multifocal IOLs. 1.Monofocal IOL According to the principle of refraction of light, light is refracted to form a focal point, which has the advantage of less visual interference after surgery, but the disadvantage is that presbyopic glasses are generally needed for reading newspapers and other close activities. The unique feature is that the aspheric design of the optical part of the IOL can offset the positive spherical aberration brought about by the cornea, thus reducing the total aberration of the eye and further improving the postoperative visual quality. The main types of IOLs available in our hospital include: ordinary monofocal aspheric IOLs (priced around RMB 3,000) and micro-incision aspheric IOLs (priced around RMB 5,500-6,000). The former is implanted through an ordinary surgical incision (incision of about 3.0mm), while the micro-incision IOL can be implanted through a minimum micro-incision of about 1.8mm, which has the advantages of less surgical trauma, less surgical astigmatism and faster recovery. 2.Multifocal IOLs The disadvantage of monofocal IOLs is that they are “clear in the distance” but “blurry in the near” and require the assistance of presbyopic glasses. “These IOLs are more expensive and are divided into ordinary multifocal IOLs (about $8,500) and multifocal induction IOLs (the so-called trifocal IOLs, which cost about $25,000) according to their principles, the former can provide most patients with good distance and near vision, while the latter can provide good distance, intermediate and near vision throughout for most patients. However, not all patients are suitable for multifocal IOL implantation, such as patients with severe fundus lesions, corneal scarring, and unhealthy capsular bags are not suitable for multifocal IOLs. Meanwhile, patients implanted with multifocal IOLs need some time for the adaptation process, and at the same time, although the IOL design has become more and more perfect, there is always a certain gap compared to their own vision when they were young, for doing things too It is not recommended for patients who pursue perfection and have harsh requirements for vision effects. 3. Other functional IOLs include astigmatism-correcting IOLs, astigmatism-correcting combined with multifocal IOLs and adjustable IOLs, which provide individualized customization for different patients and make up for some of the shortcomings of the previous two types of IOLs. In conclusion, patients can choose the most suitable IOL for themselves according to their living habits, economic situation and their own eye conditions, and with reference to the doctor’s advice, the expensive IOL is not necessarily the best, but the one that suits them is the best.