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1.56 Semi Finished Blue Cut Bifocal Photo grey optical lenses
Under the sunlight, the color of the lens becomes darker and the light transmittance decreases when it is irradiated by ultraviolet and short-wave visible light. In the indoor or dark lens light transmittance increases, fade back to bright. The photochromism of lenses is automatic and reversible. Color-changing glasses can adjust the transmittance through the lens color change, so that the human eye can adapt to the changes of environmental light, reduce visual fatigue, and protect the eyes.
