Abstract: Disorder in the packing geometry of the human cone mosaic is believed to help alleviate spatial aliasing effects. In order to characterize cone packing geometry we gathered positions of cone inner segments at 7 locations along 4 primary and 2 oblique meridians in an adult human retina. We generated statistical descriptors based on the distribution of distances and angles to Voronoi neighbors. Parameters of a compressed-jittered model were fit to the actual mosaic. Local anisotropies were investigated using correlograms. We find that: (1) median distance between Voronoi neighbors increases with eccentricity, but the minimum distance is constant (6-8 $mu@m) across peripheral retina; (2) the cone mosaic is most orderly at the edge of the foveal rod-free zone; (3) in periphery, cone spacing is 10-15% less in one direction than in the orthogonal direction; (4) cone spacing is minimal perpendicular to meridians emanating from the foveal center. The nearly constant minimum distance implies that high spatial frequencies may be sampled even in peripheral retina. Local anisotropy of the cone mosaic is qualitatively consistent with the meridional resolution effect previously described for the discrimination of gratings.!
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机译：摘要：据认为，人类锥状马赛克的堆积几何形状紊乱有助于减轻空间混叠效应。为了表征圆锥堆积的几何形状，我们在成年人类视网膜中沿着4个主要和2个斜子午线在7个位置收集了圆锥内部段的位置。我们基于到Voronoi邻居的距离和角度分布生成了统计描述符。压缩抖动模型的参数适合实际的镶嵌图。使用相关图研究了局部各向异性。我们发现：（1）Voronoi邻居之间的中间距离随着偏心率的增加而增加，但是整个周边视网膜的最小距离是恒定的（6-8 $ mu @ m）； （2）圆锥形镶嵌在无中心凹的无棒区边缘最有序； （3）在外围，一个方向的锥距比正交方向小10-15％； （4）圆锥间隔垂直于从中央凹中心发出的子午线。几乎恒定的最小距离意味着即使在周围的视网膜中也可以采样高空间频率。圆锥形马赛克的局部各向异性在质量上与先前描述的用于辨别光栅的子午分辨率效果一致。
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