The best time to treat cataracts is generally considered to be when the patient’s vision no longer meets the patient’s needs. At present, surgery is still the main treatment for all kinds of cataracts. In the past, many people thought that the best time for cataract surgery was when the cataract was mature, mainly because the surgical equipment in the past was backward and the surgical method used was mostly extracapsular or intracapsular extraction. The surgery was more traumatic and the results were relatively poor, so it was recommended to wait until the cataract was fully mature before going for treatment. However, due to the advancement of surgical techniques and equipment, it is generally believed that it is no longer necessary to wait until the cataract is fully mature before going for treatment. Therefore, when cataract patients have abnormal vision that affects their lives, surgery can be considered. In addition, patients should undergo a detailed preoperative examination and preparation before cataract surgery.