% Lens 5 (Element 6):
R1        R1_6        Radius of curvature, surface 1
R2        R2_6        Radius of curvature, surface 2
Tc        Tc_6        Center thickness
d0        d0_6        Outer diameter
d1        d1_6        Diameter, surface 1
d2        d2_6        Diameter, surface 2
d1_clear  d1_clear_6  Clear aperture diameter, surface 1
d2_clear  d2_clear_6  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