Wavelength: 200nm-2000nm, broad spectrum protection, blocking ultraviolet, blue, red, infrared laser Optical Density: OD 4+; Visible Light Transmittance: 15%, enhances green laser lines or beams in sunlight Packing list: goggles with case and cleaning cloth Even at lower power output levels, a single accidental exposure to direct or reflected laser beams can cause irreversible eye damage, depending on wavelength, output, and duration of exposure. Laser safety also prevents damage to equipment. An important factor in determining potential damage is irradiance, or power per unit area, expressed in watts per square centimeter. When we wear laser safety glasses, some wavelengths in the light spectrum that normally reach our eyes are filtered out. If we block light in the visible area, this inevitably changes our perception of the environment. First, transmission attenuation in the environment increases, resulting in a darkening effect - similar to the effect of sunglasses. Second, blocking certain wavelengths changes our perception of color.