Purpose The goal of this clinical trial is to learn how different intra-abdominal pressures during laparoscopic cholecystectomy affect the optic nerve sheath diameter (ONSD), which is a non-invasive marker of intracranial pressure. The study will also evaluate whether these changes are related to symptoms such as headache, confusion, and nausea after surgery. Study Design This is a prospective, randomized, double-blind clinical trial. Patients undergoing elective laparoscopic cholecystectomy will be assigned to one of two groups: Group 1: pneumoperitoneum at 8 mmHg Group 2: pneumoperitoneum at 14 mmHg ONSD will be measured at several time points before, during, and after surgery using transorbital ultrasonography.