Anti Blue Light Ray CR-39 Resin Aspheric Optical Prescription Lenes Lens Index:1.61 is_customized: Yes

is_customized: Yes

Color: Gold with cognac with cherry

Style : Trend Fashion

Fit: Earrings Women

Anti Blue Light Ray CR-39 Resin Aspheric Optical Prescription Lenes Lens Index:1.61 is_customized: YesHow 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: