What type of eye protection is characterized by a very narrow filter band?

The type of eye protection characterized by a very narrow filter band is dynamic filters. These filters are designed to selectively transmit certain wavelengths of light while blocking others, allowing for high levels of transmission of specific wavelengths that are critical for the intended task, such as monitoring laser operations, while effectively reducing exposure to potentially harmful wavelengths.

Dynamic filters are particularly useful in environments where laser radiation is present, as they enable the viewer to see while still providing safety against specific laser wavelengths. By filtering out only the unwanted wavelengths, they maintain visibility in the working environment.

In contrast, absorption filters block a broader range of wavelengths based on a material's absorption characteristics, which is less specific than dynamic filters. Diffraction filters or holograms work by manipulating the light based on its wavelength but do not offer the narrow filtering characteristic that dynamic filters do. Glare reduction lenses are designed to reduce overall brightness or glare rather than specifically filtering out narrowly defined laser wavelengths.