The cost of IOL varies according to different manufacturers, materials and functions. In the case of a tertiary level A hospital in Beijing, for example, the IOL implanted during surgery is an original imported product. IOLs are the major cost of surgery and the main source of out-of-pocket expenses. The cost of different IOLs varies greatly, and the more functional the IOL, the more expensive it is. Domestic IOLs of the same type are relatively inexpensive. IOLs are classified by material and morphological design: hard IOLs, soft folding IOLs, the latter being expensive; three-piece IOLs, one-piece IOLs, the latter being expensive; silicone gel IOLs, hydrophilic acrylic IOLs, hydrophobic acrylic IOLs, hydrophilic hydrophobic acrylic combined IOLs, the latter being expensive; if there is a special morphological design, such as round and square edge design, the price is higher. The price is higher if there are pre-fitted designs and tiny incision implantation designs. IOL prices are classified by different functions of IOLs: whether there is aspheric design, whether it is multi-intersection, adjustable IOL, whether it is astigmatism-correcting IOL, whether it is dyed IOL, whether it has surface drug coating IOL, etc. The above functions can be superimposed on one IOL, and the more functions, the more expensive it is. For example, the price of domestic spherical monofocal folding IOL is 500-2500 RMB, and the price of imported folding aspheric monofocal IOL is 2500-8000, where the more functions are superimposed, such as superimposed dyeing, surface drug coating, preloading, tiny incision, etc. Imported folding multifocal IOL price currently ranges from about $7500-30,000, in which the more functions are superimposed the more expensive, such as superimposed triangular point, aspheric, refractive diffraction combined with design, staining, preloading, correction of astigmatism and other functions.