Fashion Polarized Sunglasses Men Driving Glasses Night Vision Driver

Brand Name:COOLPANDASGender:MENStyle:Semi-RimlessDepartment Name:AdultFrame Material:Aluminium Magnesium Optical Attribute:Polarized Optical Attribute:Photochromic Optical Attribute:UV400Eyewear Type:SunglassesLens Height:38mm Material:TACModel Number:HBH8003Item Type:EyewearLens Width:68mmUsage Scope:Driving,Fishing,Travel,Outdoor,SportsSuitable For Face:Round Face Long Face Square Face Oval FacePackage:Box,Clean cloth,Card,glassesFrame Feature:Stylish Comfortable And Not Easily ScratchesGender/Ages:Men,Women & Youth Male What are photochromic Sunglasses?Photochromic have millions of molecules of substances such as silver chloride or silver halide embedded in them. When exposed to UV rays， as in direct sunlight， the molecules undergo a chemical process that causes them to change shape. The new molecular structure absorbs portions of the visible light， causing the to darken， and to improve vision while ensuring protection from hazardous optical radiation. The darkening of photochromic was reversible， i.e.， the became shape again once the ambient light was lowered. An ant note about photochromic : An ant note about photochromic : because they react to UV light and not to visible light， there are circumstances under which the darkening will not occur. Frist example， is in your car. Because the windshield blocks out most UV light， photochromic will not darken. Second，is indoors with ordinary lighting(Because the lighting used in daily lighting does not contain ultraviolet light)，photochromic will not darken. So the ways to activate photochromism is: Exposed to UV rays， as in direct sunlight OR Use ultraviolet light lamp (not ordinary lighting lamp). is the way to activate the photochromic function of the product. Below is a video of the buyers，you can watch on his YouTube channel at the following link https://www.youtube.com/watch?v=PxqZsYp2ozg Thank you!!!