Primary chronic angle-closure glaucoma is a type of glaucoma caused by reasons that are not yet fully understood, which leads to sudden or progressive closure of the anterior chamber angle, obstruction of the drainage of aqueous humor by the peripheral iris meshwork, and a sudden or progressive increase in intraocular pressure. In the 19th century, many ophthalmologists discovered that shallow anterior chamber is closely related to acute glaucoma. Curran first discovered that many of these cases could be successfully treated with peripheral iridectomy. Based on the above findings, many scholars proposed that the occurrence of this type of glaucoma may be related to pupillary block based on clinical observations and the effect of peripheral iridectomy in treating this type of glaucoma.