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top sale new design high quality best price best service professional factory dhagte store fast delivery with different items for your choice the lense will change colors due to the intensity of the uv light. suffering the stronger sunlight, the glassess lense will be black; in cloudy day, it changes into gray; at room or night, it's transparent. the advantage of a photochromic lens is that you can wear your eyewear all day and can change your lenses color according to light conditions.