Purpose The aim of this study was to investigate the incidence of intraocular pressure (IOP) elevation after residentperformed cataract surgery and to determine variables, which influence postoperative day 1 (POD1) IOP. Conclusions IOP elevation on the first postoperative day following residentperformed cataract surgery occurred frequently (22.0%). Increased early postoperative IOP was associated with presence of glaucoma and ocular hypertension, higher preoperative IOP, and longer axial length.