A Mixed-Reality visor (MR-visor) system and method utilizing environmental sensor feedback for replicating restricted external visibility during operation of manned vehicles, such as marine or aircraft. Adaptive hardware and software enable the user to reliably limit, modify and/or block views outside window(s) areas of the vehicle while maintaining visibility of the cabin interior and instrument control panel(s) without need for complex mechanical hardware alignment and setup. In the case of aircraft pilot training, the MR-visor can be worn by a pilot to replicate Instrument Meteorological Conditions (IMC) and other challenging scenarios.