Human crystalline lens, which is composed mainly of protein and water, can become hazy or cloudy due to aging, and the hazy crystalline lens can block light and images from being projected onto the retina. Damage to the eye, certain diseases, and even certain medications can cause this phenomenon; statistically, more than 90% of cataract cases also result from the aging process that humans must undergo, in which the lens of the eye becomes cloudy and vision is affected. The only truly effective treatment for cataracts is surgery, which involves removing the lens that has become opaque and replacing it with an artificial lens, called an IOL. IOL implantation is the most effective means of treating cataracts, and thousands of cataract patients have obtained good vision through this safe and effective surgical method. 1. Do IOLs have a life span? The IOL materials currently used are very good and can stay in the eye for a long time without changing, and do not need to be replaced for life after implantation. 2.Is the more expensive IOL the better? If the surgery goes smoothly and there are no other eye diseases, IOLs ranging from a few tens of dollars to tens of thousands of dollars can provide satisfactory post-operative vision, so IOLs are not the determining factor for post-operative vision. The difference between a few hundred dollars and a $2,000 IOL is whether it can be folded, the difference between a $2,000 IOL and a $3,000 IOL is whether it is aspheric, and the difference between a $7,000 or $8,000 IOL and other IOLs is that it takes care of the patient’s needs in both distance and near vision.