Ophthalmic surgeons have commonly used phacoemulsification since it has the advantages of small incision and foldable lens usage. In this study, we investigated the effects of Phacoemulsification (phaco) and foldable intraocular lens (IOL) on intraocular pressure. Between January 1995 and September 1996, 124 eyes of 114 patients which have been performed Phaco and implanted foldable silicon IOL were examined, retrospectively. The mean age of the patients were 57.78+15.2 year (range 15 to 58 year), 46 (40.4%) of them were female, and 68 (59.6%) were male. The mean postoperative follow-up is 4.81±1.8 months (range 15 day to 15 month). The mean value of preoperative second day. A significant increase in intraocular pressure was found (p