AIM: To compare the clinical outcomes of torsional microcoaxial phacoemulsification by using different shape tips, including Centurion ultrasound tips and Infinity tips.

METHODS:A randomized prospective study was conducted. 132 patients(132 eyes)with age-related cataract, were randomly divided into study group(Centurion ultrasound tips)and control group(Infinity ultrasound tips), 66 cases(66 eyes)in each group. Under the same parameter of the Centurion phacoemulsification instrument, all the patients received normal microcoaxial phacoemulsification and intraocular lens implantation. The cumulative dissipated energy(CDE)was recorded during the operation. The best corrected visual acuity(BCVA), corneal endothelial cell density(CD)and central corneal thickness(CCT)were compared at 1wk and 1mo after surgery. Statistical analysis of the data was performed using Student's t test and Chi-square test.

RESULTS: There was significant difference on CDE(P<0.05)between these two groups. On 1wk after surgery, the study group showed better BCVA(LogMAR)as compared that of control group, the difference was statistically significant(P<0.05). The CCT of study group was smaller than the control group on 1wk after surgery(P<0.01), but there was no significant difference on 1mo(P>0.05).

CONCLUSION: Centurion ultrasound tips can significantly reduce the cumulative dissipated energy and cause less damage to corneal endothelial cells. These findings suggest that centurion vision system phacoemulsification surgery could get earlier visual rehabilitation postoperative.