1.523/1.70 mineral glass lens 1) Abbe value: 53 2) Diameter 56MM 60MM 65MM are available 3) Power range: sph: 0_15.00 cyl: 0_6.00 4) AR and AR EMI coating available in greenish and bluish color 5)1.523 Round top and 1.523 flat top bifocal lens 6) Absorb UV ray 7) We can offer 1.523 photo gray and 1.523 photo brown lens. C Gross weight:25KGS.