Cataract surgery is the best way to treat cataracts, so what is the relationship between cataract surgery and IOLs? In this regard, many cataract patients do not understand how to choose an IOL for cataract surgery? Why is it necessary to implant an IOL after cataract removal? These are the questions that patients are torn about. Ophthalmologists point out that after removal of the cloudy lens, highly farsighted glasses must be worn to restore vision. Since there are many disadvantages or shortcomings in wearing frame glasses and corneal contact lenses, the most ideal method is to implant an artificial lens to restore vision and visual field to normal. An IOL is a special lens made of synthetic material called an IOL, which consists of silicone, polyacetal acrylic finger, and hydrogel. The shape and function of the IOL is similar to the lens of the human eye, and it is light in weight, has high optical properties, and is non-antigenic, inflammatory, carcinogenic, and biodegradable. After cataract surgery, the cloudy lens is removed and an IOL is implanted in the eye to replace the original lens so that external objects can be focused and imaged on the retina and the surrounding scenery can be seen clearly. Cataract patients want to choose the “best” IOL before surgery, and even believe that the most expensive IOL is the best, fearing that choosing the wrong one will affect their vision after surgery. The IOL is implanted in the eye to replace the function of the original lens and to focus the image in the original position so that the eye can see objects clearly. IOLs have no significant degeneration, no irritation, no biodegradation and stable optical properties in the eye. There are many types of IOLs available, and each hospital has different brands, so you can choose the right one for you according to your personal situation, not necessarily the most expensive one is the best.