% Lens 3 (Element 3):
R1        R1_3        Radius of curvature, surface 1
R2        R2_3        Radius of curvature, surface 2
Tc        Tc_3        Center thickness
d0        d0_3        Outer diameter
d1        d1_3        Diameter, surface 1
d2        d2_3        Diameter, surface 2
d1_clear  d1_clear_3  Clear aperture diameter, surface 1
d2_clear  d2_clear_3  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