Spectral analysis of spatial sampling by photoreceptors: Topological disorder prevents aliasing
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Adaptive optics imaging of the human retina
2019, Progress in Retinal and Eye ResearchCitation Excerpt :If a radial average is calculated as a function of distance from the center (which represents a spatial frequency of zero), there is a clear shoulder in the power spectrum at the frequency of the cone spacing (Fig. 9D, arrow). This ring is commonly termed Yellot's ring (Yellott, 1982) and represents the fundamental spacing of the photoreceptors. The advantage of the FFT approach is that there is no need to identify the center of each photoreceptor and it is therefore quick and not susceptible to individual differences in grading.
The organization of the cone photoreceptor mosaic measured in the living human retina
2017, Vision ResearchCitation Excerpt :For Voronoi analysis to work well requires identifying every cone photoreceptor and positioning the center of each individual cone. Other methods, based on spatial frequency content, such as autocorrelograms (Rodieck, 1991) and the power spectrum of Fourier transform (Yellott, 1982), do not require the identification of each individual cone to quantify cone spacing and cones density. These studies have provided information on the hexagonality and spacing, but little information on local anisotropies of hexagonal packing.
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