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The visible light transmission (VLT) allowed by a lens is a pretty important factor in choosing a pair of goggles. Basically, VLT is how much light a lens allows to reach your eyes. This can be pretty critical depending on the conditions on a given day. If it is cloudy or a low-light time of day (i.e. dusk), a lighter tinted lens will allow more light in and provide good contrast in the terrain. On a bluebird day, a darker tinted lens will allow less light in and cut down on the glare of the sun on the snow.