1) Nd = 1.499 2) Power range: a) Sph: -6.25~ -20.00, +6.25~ +10.00 b) Cyl: -2.25~ -4.00, -4.25~ -6.00 3) Diameter: 50 / 55 / 60 / 65 / 70mm 4) Coating: Uncoated / HC / Tintable HC / HMC / HMC + EMI Skype: clearoptical