There are usually two types of anesthesia for cataract surgery, which are chosen depending on the condition. The first is surface anesthesia, which is the most commonly used form of anesthesia because cataract surgery usually does not take too long, rarely more than half an hour, so surface anesthesia is completely adequate for the application of surgery. The commonly used drug is oxybuprocaine hydrochloride drops, which is relatively easy to use and effective. The duration of anesthesia can usually last about 1-2 hours. The second one is postbulbar anesthesia, which is for some complicated cataracts, such as traumatic cataracts or cases with lens dislocation. Since the surgery is complicated and long, it is difficult to meet the requirements of the surgery with simple surface anesthesia. In such cases, lidocaine or bupivacaine needs to be injected into the back of the eye, and the anesthesia will last longer, up to 6-8 hours, and the effect will be better than surface anesthesia.