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Oakley Goggle Lens Tint Guide
VLT - Visible Light Transmission. This is a percentage based on the amount of light that will come through to your eyes. Generally, a higher percent VLT makes it easier to see through the lens in low-light conditions. A lower VLT percentage will be more useful during very bright conditions, and when dealing with harsh reflective glare from the sun. VLT % may vary between spherical and cylindrical lens shapes.