Choose the Right Lens
In snowy terrain you need lenses that can balance and partially reduce blue light. Snow reflects the sky, so the eyes are overwhelmed by blue light and it is difficult to read the shades of the snow.
Visible Light Transmittance
When there is low light, you need an lens that allows a lot of visible light to be transmitted to the eye. In strong sunlight, you need a lens that blocks a larger portion of visible light. This is what is called VLT – Visible Light Transmittance.
The higher the percentage, the more visible light is transmitted through the lens, and the opposite. Lenses for downhill skiing are tested and categorized in to 5 categories based on VLT.
Cat 0 – Snowy, foggy, and overcast conditions, or sunset/nighttime use
Cat 1 – Cloudy weather and low light conditions
Cat 2 – Sunny and partially cloudy conditions
Cat 3 – Bright and sunny conditions
Cat 4 – Extremely bright and sunny conditions
In cloudy weather and low light conditions...
...choose Filter Category 1
In cloudy weather and low light conditions – you need a contrast enhancing lens that decreases blue light and increases orange and red. The correct lens must have a high Visible Light Transmission value to pass enough light to the eye in overcast and difficult conditions.
The orange contrast enhancing lens without mirror.
In sunny and partially cloudy conditions...
...choose Filter Category 2
In sunny and partially cloudy conditions - you need an all-round lens. A lens that both enhances contrast and that lets enough light pass through. Moving from shade to sunlight you need a lens that can do all.
The orange contrast enhancing lens with Multi-Layer Blue Mirror is our “lighter” lens for all around use.
The orange contrast enhancing lens with Multi-Layer Gold Mirror is our “darker” lens for all around use.
In bright and sunny conditions...
...choose Filter Category 3
In bright and sunny conditions – you still need to have help with the contrast in some spots, but you need a dark lens which blocks out even more light.
Orange contrast enhancing lens with Super Silver Mirror. Our darkest lens.