- O.D. (Optical Density) - Higher the O.D. number, more of the light is being blocked for the wavelength specified.
- VLT % (Visible Light Transmission) -Percentage of the visible (red-green-blue) light being passed in the visible spectrum.
FOR SAFETY: Always verify all wavelengths (i.e. 850nm, 1310nm,1550nm etc.) in use before purchasing any eyewear products. Not to be used for direct viewing into beam.