Holographic optical elements (photographically produced Fresnel zone plates) can be easily designed with lens design computer codes using an analogous lens model. From a ray tracing point of view this lens model focuses light exactly the same as a holographic optical element. The analog works for on-axis rays, off-axis rays and any wavelength.
William C. Sweatt,
"New Methods Of Designing Holographic Optical Elements", Proc. SPIE 0126, Clever Optics: Innovative Applications of Optics, (21 November 1977); doi: 10.1117/12.955887; https://doi.org/10.1117/12.955887