Incorporation of directional effects of the retina into computations of optical transfer functions of human eyes.
Two-dimensional optical transfer functions (OTF's) of individual human eyes are computed from the retinal images of a point test object, using a phase-retrieval method. The retinal reflection directionality effect is included in the computations by means of an apodization pupil, and subsequently the Stiles-Crawford effect is also considered. The modulation transfer functions obtained when the retinal reflection directionality effect is considered show lower values of the modulation; on the other hand, their two-dimensional form and the corresponding phase transfer functions remain practically unchanged. The importance of the Stiles-Crawford apodization depends on the wave aberration of the individual subject, but in general it produces an improvement in image quality, and the modulation transfer function becomes more symmetrical.
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Instituto de Optica, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
D006801:Humans; D008960:Models, Psychological; D012160:Retina / Q000502:physiology*; D014785:Vision, Ocular / Q000502:physiology*