It is necessary to know about the sunglasses parameters
1, UV mark - — Ms degree of UV protection sunglasses factory YC9703 sunglasses black/C3 dazzle colour blue UV standard refers to the meaning of: the human eye to light the perception of the range is 380 ~ 780 nm, The visible light) , is refers to under 380 nm wavelength ultraviolet light ( Not visible) 。 UV380 meaning is under 380 nm wavelength of the light can be effectively blocked. And some standard UV400 because also blocked a visible light, so will lose some color. 2, plank - — Plastic ray-ban RB4221 - F men sunglasses before 6170/55 blue circle for rubber sheet made of eye lens wear sunglass lens parameters 3, memory - — Resistance to deformation ray-ban RB8056 175/6 men sunglasses q hawksbill refers to glass frame of 4, polarization resistance to deformation ability - — Polarized light, the polarization filter color saturation, make the object contour become blurred, make the eye fatigue, discomfort. Polarized lens is made according to the principle of polarization of the light, the light of the vibration plane and polarization parallel to the axis, the polarized filter to make the polarized light through ( As the shutters principle) 。 Thus, the light is subdivided into light into the eye, the surrounding scenery looks clear and not stand out. Add another prominent advantage is the extremely light and thin, The thickness of 0. 7mm、1。 1毫米) And impact resistance, so this kind of lens is very suitable for driving and outdoor activities when wearing, over the years by the vast number of consumers love.
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