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the design and manufacturing philosophy of the picture frame is exactly the same as the precise theory of creating the lens. the material is extremely durable, comfortable to wear forever, and particularly considerate. visual clarity, through the precise manufacturing and polishing process, lenses have no optical deviation, and will not cause eye fatigue, headache or fatigue after wearing. true colors, accurate colors perceived by human eyes, high-definition vision, and clear details are presented, without missing every wonderful place. strong impact resistance, compared with glass lenses, effective shatterproof, safe and light..syi