We provide the first measures of foveal cone density as a function of axial length in living eyes and discuss the physical and visual implications of our findings. We used a new generation Adaptive Optics Scanning Laser Ophthalmoscope to image cones at and near the fovea in 28 eyes of 16 subjects. Cone density and other metrics were computed in units of visual angle and linear retinal units. The foveal cone mosaic in longer eyes is expanded at the fovea, but not in proportion to eye length. Despite retinal stretching (decrease in cones/mm2), myopes generally have a higher angular sampling density (increase in cones/deg2) in and around the fovea compared to emmetropes, offering the potential for better visual acuity. Reports of deficits in best-corrected foveal vision in myopes compared to emmetropes cannot be explained by increased spacing between photoreceptors caused by retinal stretching during myopic progression.
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机译：我们提供了视凹锥体密度作为活眼中轴长度的函数的第一个量度，并讨论了研究结果的物理和视觉含义。我们使用了新一代的自适应光学扫描激光检眼镜对16位受试者的28只眼的中央凹处及其附近的视锥进行成像。锥体密度和其他度量以视角和线性视网膜单位计算。在较长的眼中，中央凹圆锥体镶嵌在中央凹处扩展，但与眼长不成比例。尽管视网膜伸展（视锥细胞/ mm 2 减少），但与正视眼相比，在中央凹内和周围的近视眼通常具有更高的角度采样密度（视锥细胞/ deg 2 增加）。 ，可以提供更好的视敏度。与正视眼相比，近视眼中最佳矫正的中央凹视力不足的报道不能用近视进展期间视网膜伸展引起的感光器间距增加来解释。
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