Primary angle-closure glaucoma is a relatively common eye disease in Asians, and its cause is closely related to the shallowing of the anterior chamber and closure of the atrial angle caused by lens bulging during the development of age-related cataracts. In recent years, more clinical observations have shown that simple cataract extraction can prevent and treat primary angle-closure glaucoma. In our recent observations, we also found that for patients with primary angle-closure glaucoma whose IOP could be controlled within the normal range after treatment with topical IOP-lowering drugs and pupil-reducing drugs, their atrial angles had not yet formed permanent adhesions, and these patients could all achieve more satisfactory results after cataract surgery. We performed a coherent optical tomography scan of the anterior segment of the eye before and after surgery, and the computerized reconstruction of the optical scan at 2,000 teens per second was able to quickly obtain the structure of the anterior segment of the eye in the set direction and to automatically give the values of each parameter. The anterior chamber depth, anterior chamber volume, 500-micron atrial angle opening distance (500 microns tangent from the scleral eminence along the corneal surface, then a vertical line toward the iris, the length of which is the atrial angle opening distance AOD500), 500-micron trabecular meshwork iris gap area (500 microns tangent from the scleral eminence along the corneal surface, then a vertical line toward the iris, the area between the trabecular meshwork and the iris is the area between the trabecular meshwork and the iris), and 500-micron trabecular meshwork iris gap area T. The trabecular meshwork iris gap area TISA500) can effectively evaluate the structure of the anterior chamber and atrial angle. The results of the study showed that patients with closed-angle glaucoma had a common anatomical factor of a shallow anterior chamber with a narrow atrial angle. After cataract surgery, the relatively large volume of the lens is replaced by a thin IOL, resulting in a significant increase in anterior chamber depth, anterior chamber volume and atrial angle opening distance, which fundamentally addresses the pathogenic factors of closed-angle glaucoma. With the increasing maturity of cataract surgery techniques, the width of the self-closing incision through the clear cornea is gradually reduced, making the impact of surgery on corneal morphology also reduced. At present, our cataract ultrasound phacoemulsification uses a 2.2mm clear corneal incision under surface anesthesia combined with folding IOL implantation, which results in a shorter operative time, less patient pain, and far fewer postoperative complications than traditional filtration surgery. There was no significant difference in the radius of curvature and K value of the anterior and posterior surfaces of the cornea before and after surgery, indicating that the morphological changes in the cornea caused by the surgery were minimal. Therefore, in the management of patients with this type of angle-closure glaucoma, early lens extraction plus IOL implantation can be considered for units with mature conditions for cataract surgery. For patients with relatively clear lens and young age, lens extraction combined with multifocal IOL implantation can also be considered to meet the patient’s requirements for distance and near vision.