In primary angle-closure glaucoma,the iris is pushed or pulled up against the trabecular meshwork at the angle of the ocular anterior chamber. Aqueous humor is blocked and cannot drain out,thereby increasing the IOP. After the angle closes,changes will happen to the trabecular cells morphologically and physiologically. Studies show that IOP will decrease for some degree after phacoemulsification plus intraocular lens implantation and combined with goniosynechialysis for primary angle-closure glaucoma.It is suggested that the function of trabecular cells can restore partially when the angle reopened. However its specific mechanism need further research and discussion.