Trabeculectomy is a surgical procedure used to treat glaucoma, a condition that increases pressure in the eye. During the surgery, a small flap is created in the eye's surface to allow excess fluid to drain, reducing intraocular pressure. This helps to prevent damage to the optic nerve and preserve vision. The procedure is typically performed under local anesthesia and may involve a short hospital stay. After surgery, patients may need to use eye drops and attend follow-up appointments to monitor healing and ensure the desired pressure levels are maintained.