·AIM:To study the effect on cataract treated by phacoemulsification with scleral tunnel incision and implantation of the PMMA posterior chamber lens.·METHODS:There were 256 cases 295 eyes with cataract who underwent corneal tunnel incision and phacoe-mulsification.·RESULTS:There were 224 eyes(75.9%)whose vision exceeded 0.5 three months postoperatively.Retinal detachment and macular vesicular edema did not appear.·CONCLUSION:Phacoemulsification with scleral tunnel incison has many merits such as small incision and low astigmia.It can prevent complications and recover the visual function quickly.·