During the day, we are exposed to different environments, outdoor and indoor situations and light conditions. Some sunglasses wearers struggle with clear, comfortable vision whenever light conditions change, straining their eyes. Sunglasses lenses can either become too dark in the shade on cloudy days, or the colour tone can be too light on sunny days. We have applied technology based on photochromic lenses properties to ZEISS Sunlens AdaptiveSun Solutions, enabling the intelligent adaptation of the lens tone depending on the level of exposure to UV radiation.