There are many types of IOLs used in cataract surgery, usually categorized and selected from monofocal, multifocal and trifocal. 1. monofocal lens: usually there are aspheric IOLs, spherical IOLs, astigmatism correcting lens types, as the name suggests, can only see near or far, suitable for people who do not have stringent requirements on vision, or the elderly have already adapted to wearing presbyopia glasses. 2. Multi-focal crystals: Divided into diffractive and refractive types, i.e. bifocal IOLs, which can see near or far, but the objects in between may be a bit blurred. It is suitable for most people and reduces the habit of eye dependence. 3. Trifocal IOL:It is a new type of IOL with many fused focal points, which can help to restore better vision and is suitable for those who have higher requirements on their eyes. Compared with the first two, the price is more expensive. The choice of which IOL should be made under the guidance of doctor and according to your own needs, what is suitable for you is the best.