Investigation the change of anterior chamber angle structure and intraocular pressure after phacoemulsification and intraocular lens implantation

Objective To study the influence on anterior chamber angle structure and intraocular pressure (IOP) of phacoemulsification and intraocular lens implantation.Methods Phacoemulsification and intraocular lens implantation were performed in 60 eyes of 60 patients whom were divided into two groups:one group with shallow anterior chamber and narrow anterior chamber angle structure,another group with normal anterior chamber structure.All of the patients were measured values by ultrasound biomicroscopy (UBM) of ACD (anterior chamber distance),TIA (trabecular iris angle),AOD500 (angle-opening distance at 500μm from the scleral spur),and TCPD (Trabecular ciliary processes distance) at the time before surgery and 1 month and 3 months after surgery.The IOP was also recorded at the same time.Results In both groups,the measurements of ACD,AOD500,TIA and TCPD were increased significantly and the lOP was reduced significantly after the operation (P ＜0.05).The measurements and the IOP changed more significantly in the shallow anterior chamber group than in normal anterior chamber group (P ＜0.05).Comparing the measurements and the IOP one month after surgery with three months after surgery,there were no significant differences (P ＞0.05).Conclusions Phacoemulsification and foldable intraocular lens implantation can significantly deepen the anterior chamber,open the anterior chamber angle and reduce the IOP of the patients.So that it can avoid the occurrence of glaucoma and can be a surgery method of treating angle-closure glaucoma combined cataract patients. Key words: Cataract; Phacoemulsification; Chamber angle; Intraocular pressure; Glaucoma