Dark Grey Brown Anti Blue Light Photochromic Progressive Lenses Multifocal CR-39 Aspheric Optical Prescription Lens Lenses Color:Brown Lens color : Photochromatic

Lens color :  Photochromatic

Frame Material : PC

Model Number : 53846

Support : Cutomize prescription

degree : No degree

Dark Grey Brown Anti Blue Light Photochromic Progressive Lenses Multifocal CR-39 Aspheric Optical Prescription Lens Lenses Color:Brown Lens color : PhotochromaticHow 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: