The combination of a paraxial lens surface and a Zernike Standard Phase surface allows a very accurate 'black box' model  of an optical system to be built. The paraxial lens has the first order properties of the original system (namely exit pupil size and location), and the Zernike surface adds the wavefront aberration.

A simple macro allows easy transfer of the Zernike data from the original file to the Zernike surface in the black box file.

All files used in this article are contained in the zip file you can download from the link below.