A system to prevent motion sickness to at least one passenger in a moving vehicle, comprising: at least one liquid crystal film； at least one power dimmer apparatus operative to provide AC current to said at least one liquid crystal film； at least one sensor operative to sense the motion of said vehicle； at least one non-transitory computer-readable medium for producing a signal for activating and deactivating said at least one liquid crystal film in a certain frequency by means of said at least one power dimmer apparatus； wherein said activating and deactivating said at least one liquid crystal film is done in form of visual cues directly coordinated by motion sensory inputs provided by said at least one sensor.
