Ultrasound biomicroscopic observation of angle parameters in patients with angle closure glaucoma after phacoemulsification

Abstract

Objective To observe the angle parameters in primary angle closure glaucoma (PACG) after phacoemulsification.Methods Thirty eyes of 30 patients with PACG and cataract were included.Angle parameters were measured using ultrasound biomicroscopic (UBM) before surgery and 3 months after phacoemulsification with IOL implantation.Main outcome measures were central anterior chamber depth (ACD),trabecular iris angle (TIA),angle opening distance at 500 μm from scleral spur (AOD500),trabecular-ciliary process distance(TCPD),and iris distance l (IDl).Results At 3 months after phacoemulsification,there was a significant widening of the anterior chamber angle with the TIA increasing significantly (t =9.467,P =0.001) with an associated increase in AOD500 (t =9.831,P =0.001) ; TCPD (t =7.988,P =0.001) ; and ACD (t =10.244,P =0.002).There was no significant changing of the ID1 (t =1.244,P =0.070).Conclusion Phacoemulsification in eyes with PACG results in significant widening of the anterior chamber angle. Key words: Ultrasound biomicroscopy ; Anterior chamber angle ; Phacoemulsification; Glaucoma,angle closure, primary