Which PPE must be clearly labeled with the optical density and wavelength?

• A. LASER EYE PROTECTION (LEP)
• B. Safety spectacles
• C. Hearing protectors
• D. Face shield

Answer: (A)

Laser eye protection is the gear that must clearly show optical density and wavelength. The reason is that eye protection for lasers isn’t generic—you need eyewear that attenuates only the specific wavelengths your laser emits and by a level high enough to keep the eye exposure below safe limits. The optical density tells you how much the lens reduces the laser light at a given wavelength (higher OD means more attenuation). The label also lists the exact wavelengths (or range) it protects against, so you can match it to the laser you’re using. If you pick the wrong eyewear, even a sturdy-looking shield won’t provide adequate protection because it may not attenuate the laser light at that wavelength enough. Other PPE like safety spectacles or face shields and hearing protectors protect against different hazards (impact, splashes, noise) and don’t require labeling for optical density and wavelength.