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The wavelength with optimum absorbance for photochromic contacts in the cold temperature revealed a shorter change than that in the warm heat. The photochromic properties at the cold temperature had been 11.5% reduced for transmittance, 1.4 times greater for the change in optical thickness, and 1.2 times higher for the change in transmittance into the colored and colorless states, optical preventing % ratio, and change in luminous transmittance as compared to those at the hot temperature when you lo