Closed-angle glaucoma is a relatively common eye disease in the Chinese population, usually occurring in middle-aged and older adults over the age of 45. Patients have certain anatomical features of the eye before the onset of the disease, such as a smaller eye with a shorter anterior and posterior diameter, better vision when they were younger and may be somewhat hyperopic. Some have a family history. As these patients age, their own lens (a clear hemisphere in the middle of the eye that is an adjustable lens, the one that grows into a cataract in old age) becomes cloudy and expands in size at the same time, causing the space in the patient’s eye to become further narrowed, which develops to a certain point and induces angle-closure glaucoma (the space in the eye where the atrial water flows out is blocked and the intraocular pressure rises). If the cloudy and enlarged lens is removed and replaced with a thin, transparent artificial lens, the space in the eye will be reopened and the cataract will be cured, and closed-angle glaucoma will not occur.