When medication and laser surgery fail to control Glaucoma, a surgical procedure called 'filtering operation' is recommended to create an artificial outlet for fluid from the eye, thus lowering intraocular pressure. Requiring use of an operating microscope and a local anesthetic, this procedure is performed in the hospital. If such a procedure is not feasible or has failed, production of aqueous fluid may be reduced by freezing (cryoprobe) or laser energy directly applied to the eyeball over the area where the fluid is produced. The most helpful advice concerning Glaucoma is to keep in mind the importance of early detection through routine eye examination, faithful use of prescribed medications, and close monitoring by an eye doctor of the optic nerve, visual fields and pressures.