Anti Blue Light Ray CR-39 Resin Aspheric Optical Prescription Lenes Lens Index:1.61 clear fashion glasses gafas de

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Model Number: BG120

Model Number: XL536

Usage scope: : Fishing Hiking Camping Shopping Party Travel T Show Driving Sport

Style : Trend Fashion

Anti Blue Light Ray CR-39 Resin Aspheric Optical Prescription Lenes Lens Index:1.61 clear fashion glasses gafas deHow to choose lens index Lens index reflects lens thickness, there is 1. 56, 1. 61, 1. 67 index etc. The higher lens index is, the thinner lens is. 1. 67 is thinner than 1. 61 than 1. 56 at the same degree. Lens thickness also depends on frame size. The bigger frame is, the thicker lens is. 1. 56 index suggestion degree: SPH: 0. 00 ~ 4. 00; CYL: 0. 50~ 2. 00 SPH: +0. 50~+4. 00; CYL:+0. 50~+2. 00 1. 61 index suggestion degree: SPH: 0. 00 ~ 6. 00; CYL: