The principle of photochromic lenses mainly relies on the special chemical reaction of ultraviolet rays. sunglasses wholesale，The photochromic lenses of sunglasses contain millions of molecules of certain substances, such as silver chloride or silver halide. Visible light, a common component of artificial light sources, penetrates these molecules in the absence of UV light.
But when exposed to sunlight's ultraviolet rays, the molecules undergo a chemical process that changes their shape. The new molecular structure absorbs some visible light, darkening the lenses. The number of shape-changing molecules varies with the intensity of the UV light.
With the increasing popularity of plastic lenses, a new method has been developed. By immersing the plastic lens in a chemical bath, the color-changing molecules will be absorbed into the plastic lens to a depth of about 150 microns.
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