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Chapter 11:
CAGE Imaging Performances
Author(s): Pier Giorgio Gobbi
Published: 2013
DOI: 10.1117/3.975277.ch11
This chapter presents the numerical results obtained for axial unaccommodated imaging in the CAGE eye model, according to the descriptors given in Chapter 10. In almost every figure in this chapter, plots are split into two parts to separate monochromatic from broadband evaluations, thus allowing for a clearer comparison between the two sets of curves. The reported pupil size throughout refers to the diameter of the entrance pupil, as measurable from outside the eyeball, given by Dent = Dp • ment. For broadband illumination, pupil size is evaluated at central wavelength λ0. Monochromatic calculations are obtained under the following parameters: p = 8192 points (13 bits); NF = 300; and λ0 = λd = 587:6 nm. Broadband calculations are taken under the same number of discretization points p and with λ0 = 570 nm, λS = 400 nm, λL = 770 nm, Δλ= 5 nm, and NF(λ0) = 300. The spectral distribution used is the CIE standard illuminant A, qA(λ). All variables relative to this spectrum are denoted by subscript W. In each figure, performance of the CAGE model is drawn with a thick solid line, and lies sandwiched between two opposite behaviors: the SPH model (thin line with crosses), and a model free of monochromatic (spherical) aberrations, but with Stiles-Crawford apodization of pupil transmittance (thin line with open circles, labeled DLSC), characterized by Wex,λ(rex) ≡ 0 at any wavelength. A fourth set of curves is reported (thin lines with solid triangles, labeled DLHE), relative to the diffraction-limited condition with hard-edge pupil, which represents a sort of ultimate performance theoretically attainable. For monochromatic illumination, the DLHE model is described by the analytical formulas.
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