Right now, when we enter a room with low light, a rod cells in your eyes take time to adjust and see clearly. But in red-lit environments, a rod cells send aloft contrariety images to a brain, creation it easier to make out objects. So in dim environments (like a photography room), red lights are mostly used to urge visibility.
IBM has only law record that uses this capability to supplement night prophesy capability to Google Glass. According to a IBM’s patent, Google Glass is mutated to embody a red-color projector for any eyeglass lens.
So when a user enters a low-light environment, a projector automatically projects a low-level red light in to any eye of a user. Shining red light directly into a eyes creates a same response rods as casting red light (from a bulb) onto an environment. Which means it tricks a rod cells into promulgation aloft contrariety images to a brain. Giving us all a event to have night-vision goggles.