Trail Running (UK) - - Sunglasses Test -

The Vis­i­ble Light Trans­mis­sion (VLT) of a lens is the amount of light let through the lens. Cat­e­gory 0 lenses are clear and let through up to 100%; cat­e­gory 4 are very dark and let through be­tween 3-8%; th­ese are used in snow and around wa­ter.

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