Averaging over the foveal receptor aperture curtails aliasing.

@article{Miller1983AveragingOT,
  title={Averaging over the foveal receptor aperture curtails aliasing.},
  author={William H. Miller and Gary D. Bernard},
  journal={Vision research},
  year={1983},
  volume={23 12},
  pages={1365-9}
}
We show that the entrance aperture of the foveal cone is about 80% of the 3 micron center-to-center spacing. Reduction in contrast caused by averaging of illumination over this aperture prompts us to predict detection with aliasing between the Nyquist limit of 60 c/deg (where contrast reduction is 63%) and 150 c/deg (where contrast is zero) when the eye's optics are bypassed by impressing interference fringes directly on the fovea. 

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