Glaucoma is classified into primary glaucoma, secondary glaucoma, mixed glaucoma and congenital glaucoma. Primary glaucoma is a disease that has no exact connection with recognizable eye diseases, and there are two basic types of this type of glaucoma, namely closed-angle glaucoma and open-angle glaucoma; secondary glaucoma is an eye change caused by eye diseases or certain systemic diseases, which affects the drainage of intraocular atrial fluid and leads to an increase in intraocular pressure, and it is also divided into secondary closed-angle glaucoma and secondary open-angle glaucoma; mixed glaucoma is It is also divided into primary congenital glaucoma and glaucoma combined with congenital anomalies or syndromes.