ya why didnt they put directions in the box smh...
There is no rating to show the level of quality to show the scratch -resistant quality of the sunglasses. You have to look at the type of material the sunglass is made of to know.
The focal length of a Sunglass lens is theoretically infinite. It is because the radii of curvatures of the front and back surfaces are equal.
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Parts of sunglasses are : Lens, Bridge, sweat bar, Nose pad, Hinge, Frame eye wire, End Piece, Temple, temple tip.
G-Shock is a sportswatch line by Casio that are designed to be water-resistant and shock (impact) resistant.
The G-15 or G15 XLT is a Green-Gray lens that is the most popular general purpose lenses and used by a huge variety of sunglass makers. The 15 refers to the amount of light allowed to pass through the frame which in this case has approximately 85% light absorption. - Surfeyes.com
From what I read, the diamond hard lenses are supposed to be 10 times more resistant to scratches.
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a polymer that is resistant and that does not break easily wh
Coach is a sunglass brand. It begins with the letter C.
Machined Plastics manufactures and distributes plastic products that are temperature resistant, dimensionally stable, chemical resistant, tough and impact resistant.