% Lens 2 (Element 2):
R1        R1_2        Radius of curvature, surface 1
R2        R2_2        Radius of curvature, surface 2
Tc        Tc_2        Center thickness
d0        d0_2        Outer diameter
d1        d1_2        Diameter, surface 1
d2        d2_2        Diameter, surface 2
d1_clear  d1_clear_2  Clear aperture diameter, surface 1
d2_clear  d2_clear_2  Clear aperture diameter, surface 2
nix       0           Local optical axis, x-component
niy       0           Local optical axis, y-component
niz       1           Local optical axis, z-component