Finished lens features: 1) Reflective index: 1.59 2) Abbe value: 32 3) Specific gravity: 1.20 4) Transmittance: 91% 5) Diameter: 70mm for minus power and 65mm for plus power 6) Power range: a) SPH: Plano to -6.00 / CYL:0.00 to -2.00 b) SPH: +0.25 to +4.00 / CYL:0.00 to -2.00 c) RX: SPH: -6.25 to -10.00, SPH: +4.25 to +6.00 d) CYL: -2.25 to -4.00 7) Minus power exceed -4.00 and all plus power lenses are with aspherical design 8) Available in tintable hard-coated, hard-coated, hard multi-coated Skype: clearoptical