3 LENSES, 3 LIGHT TRANSMISSION RATINGS:
- SILVER MIRROR - CAT 3 VLT 14%
- BLUE - CAT 1 VLT : VLT 63%
- CLEAR CAT0 : VLT 92%

VLT is the light transmission rating, which is the amount of light that the lens lets through. The lower the VLT, the darker the lens will be, providing more filtering. The higher the VLT, the brighter the lens will be.