To know the effect of trabeculectomy on controlling intraocular pressure (IOP) and thus glaucoma progression and the final visual outcome of the patient. A descriptive study of trabeculectomies performed for different types of glaucoma, during a period of three years (from Jan 2000 to December 2002) in Eye unit LRH, Peshawar was carried out. Trabeculectomies performed on all ages were included. A proforma was made showing name, age, sex file number and diagnosis. preoperative and postoperative visual acuity and IOP. recorded. Any postoperative complication was also noted. The use of Mitomycin C was also noted which was restricted only to failed trabeculectomy and younger patietns. Trabeculectomy is still one of the most used approaches for surgical reduction of IOP. Primary trabeculectomy is a better method for cases in which a larger redcution in IOP is the aim of the treatment, especially in glaucoma patients who can not afford costly medicines, having poor compliance and still having high IOP despite maximum tolerable and glucoma medication.