The operation to control the pressure within your eye is called a Trabeculectomy (trab-ec-u-lec-tomy). A Trabeculectomy operationis recommended for patients whose glaucoma continues to progress despite using eye drops and/or having laser treatment.The goal of the Trabeculectomy surgery is to help lower and control the eye pressure. The eye pressure is known as intraocular pressure. If this remains high, then further irreversible loss of vision from glaucoma may occur. This operation will not improve your vision or cure glaucoma, but aims to prevent or slow down further visual loss from glaucoma damage.