% Lens 1 (Element 1):
R1        R1_1        Radius of curvature, surface 1
R2        R2_1        Radius of curvature, surface 2
Tc        Tc_1        Center thickness
d0        d0_1        Outer diameter
d1        d1_1        Diameter, surface 1
d2        d2_1        Diameter, surface 2
d1_clear  d1_clear_1  Clear aperture diameter, surface 1
d2_clear  d2_clear_1  Clear aperture diameter, surface 2
nix       nix         Local optical axis, x-component
niy       niy         Local optical axis, y-component
niz       niz         Local optical axis, z-component