The benefits of virtual reality (VR) in managing pain and anxiety for critical care patients has never been demonstrated, even if a positive effect has been demonstrated in other populations of patients. A preliminary survey in 8 critical care units equipped with the VR mask, identified a under-use of masks by critical care teams. Before addressing the question of the effectiveness of the VR mask in a population of critical care patients, we must first identify the barriers and facilitators to its use and propose a new organization in critical care units promoting the use of VR mask by autonomous caregivers. A qualitative study will be conducted with patients and caregivers of a critical care unit to identify the barriers and facilitators to the use of virtual reality masks in the management of pain and anxiety by caregivers.