Purpose: to compare corneal incision width after phacoemulsification and intraocular lens implantation (IOL) using different delivery systems.Methods: one hundred and seventeen patients with cataract and no other anterior segment pathological features or previous eye surgery underwent cataract surgery with IOL implantation through a 2.2 mm incision. Three foldable IOL were implanted with their recommended delivery systems: Acrysof © SN60WF with Monarch © III/cartridge D (Group A, 38 patients); Tecnis © ZCB00 with Unfolder Platinum/cartridge easy load (Group B, 38 patients); Acrysof © SN60WF with Ultrasert TM preloaded system (Group C, 42 patients). Incision width was measured before and after phacoemulsification and IOL implantation.Results: Before and after phacoemulsification incision width was, respectively, 2.21 ± 0.02 mm and 2.34 ± 0.08 mm in group A; 2.20 ± 0.02 mm and 2.31 ± 0.06 mm in group B; 2.20 ± 0.02 mm and 2.30 ± 0.07 mm in group C. Incision width was not significantly enlarged after phacoemulsification. Before and after IOL implantation incision width was, respectively, 2.34 ± 0.07 mm and 2.47 ± 0.07 mm in group A; 2.32 ± 0.06 mm and 2.45 ± 0.08 mm in group B; 2.30 ± 0.07 mm and 2.39 ±0.07 mm in group C. Incision widths in group C were significantly different to groups A and B.No relationship was found between incision sizes and phacoemulsification time, ultrasound energy and IOL powers. Conclusion:In cataract surgery Ultrasert TM enlarges the corneal incision less than other delivery systems.