Specifications and Availability - Material : 1.56 Index Resin (nd=1.549, Abbe=38, Specific gravity=1.28) -Lens Size : 65mm Diameter with optics centered -Nominal Base Curve : 12.0, 14.0, 16.0 -Tolerance of Center & EdgeThickness : ± 0.3mm -Tolerance of Diameter : ±...