Cataract surgery on both eyes is usually better at least 2~3 days apart, the specific time needs to be judged according to the actual situation of the patient after surgery. At present, the commonly used cataract surgery is ultrasonic emulsification cataract aspiration, which has fewer postoperative complications. Since patients usually need to use medical gauze to cover the operated eye on the first day after the surgery to avoid infection of the surgical wounds, if patients undergo surgery on both eyes at the same time, it will affect the normal life of the patients after the surgery, so it is generally recommended that patients should have an interval of at least 2~3 days. If the surgery is performed on both eyes at the same time, it will affect the patient’s normal life after the surgery. Therefore, it is generally recommended that patients wait at least 2 to 3 days between operations. Since there are large individual differences between patients, the exact interval between surgeries needs to be judged according to the actual situation of the patient. If a patient develops an infection in the operated eye after surgery, the second surgery should be performed after the infection is eliminated. To summarize, there is no definite time interval between cataract surgeries for both eyes, and patients can arrange the surgery time under the guidance of their doctors according to their actual conditions and vision needs.