Neuro-Mimic Indicators of Anesthesia Depth During General Anesthesia

Inclusion Criteria: * The study will include patients aged 18-65 who will undergo elective abdominal surgery (e.g., cholecystectomy/gastrectomy/colorectal surgery/prostatectomy/hysterectomy, etc.) under general anesthesia, with a planned duration of 1-3 hours. * Patients whose eye area is left uncovered and who are in a position suitable for observation * Patients who have signed the informed consent form * Patients with an ASA score of I-III Exclusion Criteria: * Patients undergoing surgical procedures in the head, neck, or face region (e.g., ENT, eye, jaw surgery, neurosurgery, thyroid/parathyroid) * Patients whose eye area must be completely covered with a sterile drape * Patients with an ASA score of IV or higher * Individuals with neurological disorders and impaired pupil response, patients who have previously undergone eye trauma or surgery and cannot undergo pupil evaluation * Patients who are unable to communicate and cannot provide informed consent * Emergency surgeries (e.g., appendectomy/ileus/gastrointestinal perforation/cesarean section/gunshot wounds/stab wounds/multiple trauma/traffic accidents, etc.) * Individuals who have previously been included in this study (to prevent repeated inclusion)