The imaging properties of an eye model are fully characterized by its impulse response, ASF, or its modulus squared (the physically recordable PSF). Evaluation of PSF for the CAGE model can be performed according to the method provided, with the major difference being the location of the stop inside the eyeball at the iris plane, and not outside. As a consequence, diffractive propagation of the optical field from a point source at infinity to the fovea must be split into three parts: from source to entrance pupil; from entrance to exit pupil; and from exit pupil to fovea. This calculation is first performed for monochromatic illumination, assuming a central wavelength λ0 coincident with λd = 587.6 nm, and the refractive indices originally given by Gullstrand.
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