1) refractive index: 1.499
2) abbe value: 58
3) specific gravity: 1.32
4) raw materials are imported: cr39 ppg
5) up-to-date surface curvature design, slim and thin
6) diameters: 50mm, 55mm, 60mm, 65mm, 70mm
7) power range:
for 50mm, 55mm and 60mm:
a) sph: plano ~ +8.00 / cyl: -0.25 ~ -2.00
b) rx power: cyl: -2.25 up to -4.00, -4.25 up to -6.00
for 65mm and 70mm:
a) sph: plano ~ -6.00 / cyl: -0.25 ~ -2.00
b) sph: +0.25 ~ +6.00 / cyl: -0.25 ~ -2.00
c) rx power: cyl: -2.25 up to -4.00, -4.25 up to -6.00
skype: clearoptical