Versjtini color-changing film is used for TAC color-changing lenses, which makes the color-changing efficiency successful within 25 seconds. When the lens is exposed to too much ultraviolet light, the color of the lenses will be deepened automatically, the transmittance will be reduced, and the transmission of ultraviolet light will be prevented effectively After the disappearance of ultraviolet light, the lens to restore colorless, increased transmittance. Different weather and lighting conditions show different color changes, so that the glasses in different environments show a different vision.