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On the Relation Between the Stiles-Crawford Effect and Its Optical Equivalent

PURPOSE

The Stiles–Crawford Effect (SCE), that makes the visual sensitivity dependent on exact pupil location of an incident beam, and its optical equivalent, the Optical SCE (OSCE), manifested by a directional component of light reflected back from the retina, can be explained by the waveguide properties of photoreceptors. However, there is a commonly–observed difference by a factor of two of the directionality parameter measured with the two techniques at the fovea. We propose a photoreceptor–to–light coupling model to explain the directionality parameters normally observed in both the SCE and the OSCE.

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