This document contains a more detailed description of the ENZ-diffraction theory and clarifies the special features and potential applications of the theory. The contents of this document are the following: - A short description of the basic diffraction integral - Zernike representation of pupil functions - The propagation from the pupil to the focal region - Solving the aberration retrieval problem using the ENZ-approach - Advanced ENZ-theory - A survey of the literature on the subject - Current research and future extensions of the ENZ-approach - Application of the ENZ-approach to acoustical diffraction problems (ANZ) - A listing of the ENZ-publications For the details of the application of the theory like the numerical implementation, convergence issues, high-numerical aperture complications, vector diffraction theory etc., the reader can consult bibliographic references that are introduced in this text and in the bibliography section of this webpage.
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