1. What is the best time for cataract surgery? With the increasing maturity of cataract surgery, there is no longer any technical difficulty in performing cataract surgery at any time. Cataract surgery can be performed when the damage to vision caused by cataract affects the patient’s normal life. Visual acuity does not fully represent the quality of a patient’s vision. Some patients can still have vision of 0.8 or more through the gap in the cataract, while their lives will still be affected due to the darkened visual field. Therefore, visual acuity is only one of the indicators for choosing the timing of surgery, and the decision of when to have surgery depends mainly on the patient’s needs. Doctors do not recommend patients to wait for cataract to mature before surgery, because cataract development to the middle and late stages (such as swelling stage and over-ripe stage), if left untreated, will produce many serious complications, such as glaucoma and uveitis, which may lead to irreversible damage to vision. Therefore, cataract must be treated surgically when it develops to a certain level. 2. Is there an age limit for cataract surgery? As China enters an aging society and the standard of living improves, more and more elderly people need cataract surgery. There is no uniform age limit for cataract surgery. Some elderly people are in good health, with stable blood pressure and heart condition. Moreover, cataract surgery is now very short, and most of them use spot anesthesia (surface anesthesia) with minimal pain, so most elderly patients can afford the surgery. The oldest patient I have performed cataract surgery on so far is 96 years old. Therefore, the ability to tolerate cataract surgery does not depend on age, but on the patient’s physical condition. 3.How long does an IOL last? How to choose? Is the more expensive the better? After the IOL is implanted in the eye, it does not need to be replaced if there are no special circumstances, and it can be used for the rest of its life. At present, the most popular choice in clinical work is the imported folding crystal, which can be implanted through a 2.8-3.2mm surgical incision and costs about $2000-3000. It is suitable for more than 90% of the patient population. There are also some high-end crystals, which cost 5000-10000 RMB and have certain additional functions such as: reducing the sense of glare, suitable for night driving, and can replace some of the functions of fancy glasses, etc. They are suitable for the patient group with good economic conditions and high requirements for eye use. Therefore, the choice of IOL depends on your specific situation, not that the higher the price the better the post-operative vision.