AIM: To evaluate surgical outcomes(SOs) and visual outcomes(VOs) in cataract surgery comparing the Centurion? phacoemulsification system(CPS) with the Infiniti? phacoemulsification system(IPS).METHODS: Prospective, consecutive study in a singlesite private practice. Totally 412 patients undergoing cataract surgery with either the CPS using the 30-degree balanced? tip(n=207) or the IPS using the 30-degree Kelman? tip(n=205). Intraoperative and postoperative outcomes were documented prospectively up to one month follow-up. Nuclear sclerosis(NS) grade, cumulated dissipated energy(CDE), preoperative corrected distance visual acuity(CDVA), and CDVA at one month were recorded. RESULTS: CDE was 13.50% less in the whole CPS compared with the whole IPS subcohort. In eyes with NS grade III or greater, CDE was 28.87% less with CPS(n=70) compared with IPS(n=44)(P=0.010). Surgical complications were not statistically different between the two subcohorts(P=0.083), but in the one case of vitreous loss using the CPS, CDVA of 6/4 was achieved at one month. The mean CDVAs(VOs) at one month for NS grade III and above cataracts were-0.17 log MAR(6/4.5) in the CPS and-0.15 log MAR(6/4.5) in the IPS subcohort respectively(P=0.033).CONCLUSION: CDE is 28.87% less, and VOs are significantly improved, in denser cataracts in the CPS compared with the IPS. The authors recommend the CPS for cases with denser nuclei. AIM: To evaluate surgical outcomes (SOs) and visual outcomes (VOs) in cataract surgery comparing the Centurion ™ phacoemulsification system (CPS) with the Infiniti® phacoemulsification system (IPS). METHODS: Prospective, consecutive study in a singlesite private practice. Totally 412 patients undergoing cataract surgery with either the the CPS using the 30-degree balanced® tip (n = 207) or the IPS using the 30-degree Kelman® tip (n = 205). Intraoperative and postoperative outcomes were documented prospectively up to one month follow-up. Nuclear sclerosis (NS) grade, cumulated dissipated energy (CDE), preoperative corrected distance visual acuity (CDVA), and CDVA at one month were recorded. RESULTS: CDE was 13.50% less in the whole CPS compared with the whole Surgical complications were not statistically different between the two subcohorts (P = 0.010). In contrast, IPS was subcohort. In eyes with NS grade III or greater, CDE was 28.87% less with CPS (n = 70) compared with IPS = 0.083), but in the one case of vitreous los s using the CPS, CDVA of 6/4 was achieved at one month. The mean CDVAs (VOs) at one month for NS grade III and above catacts were-0.17 log MAR (6 / 4.5) in the CPS and-0.15 log MAR (6 / 4.5) in the IPS subcohort respectively (P = 0.033) .CONCLUSION: CDE is 28.87% less, and VOs are significantly improved, in denser cataracts in the CPS compared with the IPS. The authors recommend the CPS for cases with denser nuclei.