Surgical management of glaucoma.

Surgery plays an important role in the treatment of glaucoma. For the angle-closure glaucomas, surgery is the primary mode of treatment to restore the normal route of aqueous out of the eye. For the open-angle glaucomas, surgery is usually a secondary treatment modality, indicated after medical therapy fails to halt glaucomatous damage or does not reduce the intraocular pressure to an acceptable level for an individual's eye.