Both automatically adjust their tint as light changes, but standard photochromic lenses can be sensitive to temperature, reacting more slowly in cold conditions. ChromaPop™ Glacier PhotoChromic lenses are specially formulated to perform in extremely cold conditions, so they stay responsive at elevation and in freezing temperatures where standard photochromic lenses would lag. They also include ChromaPop™, which filters the crossover of red, blue, and green light for sharper clarity, contrast, and color on snow.