Incisional surgery
This is usually considered when drug therapy and laser surgery have failed. Trabeculectomy (creation of a fistula) is the most common treatment. This involves excising a tiny portion of the trabecular meshwork to create an opening and provide an alternative route for the drainage of aqueous humour. This reduces the pressure and prevents further damage. The aim is to achieve incomplete healing of the surgical wound with the formation of a bleb (a small blister) at the excision site. gonioscopy should also be performed annually because the anterior chamber becomes shallow with age (Kanski 2007).