1.56 Photochromic Flat Top Bifocal Lens

We are offering photochromic flat-top bifocal lens. description: photochromic flat-top bifocal lens,aspherical lens,bifocal lenses available color: greybrown fast dark, fast clear refraction index nd=1.56 diameter: 7028mm abbe value: 38 product details: available color: greybrown fast dark, fast clear refraction index nd=1.56 diameter: 7028mm abbe value: 38 specific gravity: 1.28 high scratch resistance 35% thinner than cr-39 lens hmc+emi coating and uv protection