Inclusion Criteria:  Being over 18 years old Taken to elective vitrectomy surgery Asa I - II - III patients GKS 15  Exclusion Criteria:  Emergency surgeries Patients with a GCS of less than 15 or whose cognitive functions have not been evaluated as clinically sufficient. In cases that cause the termination of the surgical procedure for any reason during the operation Patients followed by neurosurgery and patients with intracranial events