·AIM:To evaluate whether or not to combine peripheral iridotomy with phacoemulsification and intraocular lens implantation to remedy patients with angle-closure glaucoma in the preclinical and presymptomatic phases.·METHODS:Forty patients 40 eyes with angle-closure glaucoma in the preclinical and presymptomatic phases were randomly divided into two groups:group A(phacoemulsification and intraocular lens implantation)and group B(phacoemulsification and intraocular lens implantation combined with peripheral iridotomy),to statistically analyze the postoperative corrected vision,intraocular pressure,anterior chamber depth,grading of the anterior chamber angle(scheie)of the two groups.·RESULTS:No severe complications occurred in two groups,hyphema occurred in one eye in the group B,and it recovered after symptomatic treatment.The two groups’ corrected vision were improved postoperatively compared with.preoperative.There was no significant diference in the postoperative corrected vision,intraocular pressure,anterior chamber depth,grading of the anterior chamber angle(scheie)between group A and group B.·CONCLUSION:The management of angle-closure glaucoma in the preclinical and presymptomatic phases by phacoemulsification and intraocular lens implantation can prevent its acute on set and improve the corrected vision.It’s not necessary to combine peripheral iridotomy with phacoemulsification and intraocular lens.·