In the past, cataract surgery was called restoration surgery. Today, everyone undergoing cataract surgery not only wants to see clearly, but also needs to see well, both far and close. The most commonly asked question for doctors before surgery is: What kind of artificial lens should I use? What is the difference between single focus and multifocal crystals? Is a more expensive crystal necessarily better? At present, crystals on the market are mainly divided into the following categories according to their functions: single focus artificial crystals, bifocal, tri focus artificial crystals, and continuous range artificial crystals. Today, ophthalmologists will answer how to choose the most suitable artificial lens for you, teaching you to only buy the right one and not the expensive one. As the name suggests, single focus intraocular lenses have only one focal point and can only be seen far or close. The advantage is that they are inexpensive and have less postoperative visual interference, making them suitable for most elderly people. If you only need to go for a walk, buy groceries, cook, and take care of your grandchildren in your daily life, without the habit of long-term close reading, then it can completely meet your needs. After choosing a single focus intraocular lens, doctors usually ask if you prefer to see far or near after surgery, and choose different degrees of intraocular lenses according to your requirements. It is generally recommended that you keep your original lifestyle habits. If you have high myopia for many years before surgery and have become accustomed to wearing myopia glasses, it is recommended to keep this habit. The difference is that the previously high degree of myopia can be reduced to around 300 degrees; If the degree of myopia is not high before surgery, it is also possible to avoid wearing glasses to see far and clearly after surgery. It is difficult to see small characters up close, but wearing glasses of appropriate degree can also make reading very clear. Conclusion: If you are not averse to wearing sunglasses or myopia lenses (for highly myopic patients), single focus intraocular lenses are a good and cost-effective choice. Trifocal intraocular lenses theoretically solve the problem of single focal lenses having blurred vision when viewed far but near, and can provide good full range vision for most patients. However, they are relatively expensive. If you don't want to wear glasses even when looking far or close, and you have to look at your phone, computer, or drive, and the economy allows it, perhaps this is a good choice. However, multifocal intraocular lenses have strict limitations on the patient's eye conditions and are not suitable for everyone, such as severe fundus lesions, corneal lesions, and patients with large astigmatism. At the same time, a certain adaptation process is required after surgery, and it may be uncomfortable to see things. Patients who require strict visual quality are not recommended to implant. Conclusion: If you are unwilling to wear glasses after surgery and economic conditions permit, you can choose a three focus lens. However, whether it is suitable for a three focus intraocular lens ultimately depends on a comprehensive evaluation by your surgeon. Continuous range intraocular lenses, whether single focus or multifocal, do not have the same regulatory ability as our own crystals. The continuous range artificial lens simulates the continuous zoom function of the human eye, and generally has better mid range and far vision after surgery. According to observations, typically 50% of patients still need to wear reading glasses when viewed closely. It is also quite demanding for patients to choose their eye conditions, similar to the limitations of three focus intraocular lenses. The price of such artificial crystals