Natural lens material: the High Index Lenses Meaning of this material is made of quartz finely ground, mainly composed of silica (Sio2), 100% Sio2 in pure crystal. Advantages: material hardness is relatively large, not easy to wear; Disadvantages: can not completely absorb the ultraviolet rays of the sun, also can not reduce the transmittance of infrared ray.
PC Transition Lenses material: the material of this lens is solid, mainly composed of polycarbonate, a thermoplastic material. Eyeglasses Transition Lenses can only be formed after heating, so this kind of lens has strong toughness and is not easy to break, so it is called safety lens. At just 2 grams per cubic centimeter, it is the lightest material currently used for Transition Mirror Lenses. Advantages: Light, safe, suitable for frameless glasses, because it is not easy to crack; Disadvantages: processing is difficult, the surface is easy to scratch, thermal stability is not good, 100 degrees will become soft.
没有评论:
发表评论