Before the 1980s, it was known that cataracts should wait until they were “mature” before surgery, because the medical level and medical equipment at that time were limited, and surgery was considered appropriate at that stage. Ultrasonic cataract and IOL implantation was a major breakthrough in the field of ophthalmology in the 1990s. As a result, the so-called “maturity” of cataracts has long since become obsolete. Elderly patients with O.3 vision or corrected vision below 0.6, if the cause of the low vision is related to cataract, can undergo surgery to improve the quality of vision and thus obtain a good quality of life. Those with systemic diseases such as hypertension and diabetes, which cause fundus lesions and are all accompanied by cataracts, should have the clouded lens removed early if there is no contraindication to cataract surgery. Implantation of IOL. The post-operative visual acuity of these patients is definitely not as good as that of simple senile cataracts, and there are many complications. However, only when the cataract is resolved can the existing or upcoming fundus lesions be observed and treated in a timely manner, thus improving or retaining the existing visual acuity. Otherwise, the fundus disease is lost to treatment and further surgery is futile. For a patient with a cataract with a narrow atrial angle, early surgery can prevent glaucoma attacks while improving the quality of life. For glaucoma with cataract, combined glaucoma cataract surgery is feasible.