Rovamo J, Virsu V
Exp Brain Res. 1979;37(3):495-510. doi: 10.1007/BF00236819.
Comparisons of the published data on the density D of receptive fields of retinal ganglion cells and on the cortical magnification factor M indicated that M2 is directly proportional to D in primates. Therefore, the human M can be estimated for the principal meridians of the visual field from the density-distribution of retinal ganglion cells and from the density of the centralmost cones. Using the previously published empirical data, we estimated the values of the human M and express the values in four simple equations that can be used for finding the value of M for any location of the visual field. The monocular values of M are not radially symmetric. These analytically expressed values of M make it possible to predict contrast sensitivity and resolution for any location of the visual field. We measured contrast sensitivity functions at 25 different locations and found that the functions could be made similar by scaling the retinal dimensions of test gratings by the inverse values of M. Visual acuity and resolution could be predicted accurately for all retinal locations by means of a single constant multiplier of the estimated M. The results indicate that the functional and structural properties of the visual system are very closely and similarly related across the whole retina. Visual acuity, e.g., bears the same optimal relation to the density of sampling executed by retinal ganglion cells at all locations of the visual fields.
对已发表的关于视网膜神经节细胞感受野密度D和皮质放大因子M的数据进行比较表明，在灵长类动物中M2与D成正比。因此，可根据视网膜神经节细胞的密度分布以及最中央视锥细胞的密度，估算出视野主要子午线上的人类M值。利用先前发表的经验数据，我们估算了人类M值，并将这些值用四个简单方程表示，这些方程可用于求出视野中任意位置的M值。M的单眼值并非径向对称。这些通过分析得出的M值使得预测视野中任意位置的对比敏感度和分辨率成为可能。我们在25个不同位置测量了对比敏感度函数，发现通过用M的倒数缩放测试光栅的视网膜尺寸，可使这些函数变得相似。借助估算出的M的单个常数乘数，可准确预测所有视网膜位置的视敏度和分辨率。结果表明，视觉系统的功能和结构特性在整个视网膜上密切且相似地相关。例如，在视野的所有位置，视敏度与视网膜神经节细胞执行的采样密度具有相同的最佳关系。
