Astronomers spend most of their lives in the dark.
Unfortunately, as we age our ability to see in darkness degrades. Night Owl Optics has a helpful solution by the name of Night Vision Monoculars . Light is gathered by and passes through the objective lens, then travels to the portion of the EIT known as the photocathode screen. There the electrons hit a phosphorescent screen at great speed and illuminate it to create an image that rests on the back of the intensifier tube. An ocular at the back end of the device magnifies this image.