Laser safety glasses use a process called attenuation, which limits the amount of energy passing through the lens. We offer two types of laser safety glasses: glass and plastic. Glass lenses contain rare elements that absorb the energy, thus preventing the energy from reaching your eyes. On the other hand, plastic lenses have inorganic dyes that block the passing of the certain wavelengths. Plastic lenses block specific wavelengths, which is why it’s important to know which wavelengths you want to protect yourself from. Since plastic lenses contain dyes, they tend to be darker than glass lenses for the same wavelength ranges. It is important to consider the differences between glass and plastic lenses before choosing laser glasses in your wavelength range.