Westheimer G
J Opt Soc Am. 1977 Feb;67(2):207-12. doi: 10.1364/josa.67.000207.
Resolution (visual acuity) and differential spatial localization (hyperacuity) targets were selected to allow rigorous psychophysical measurements as well as ready expression of both their spatial frequency spectrum and their retinal image light distribution. Thresholds were about 1 arc min for acuity and 4-6 arc sec for hyperacuity. As is consistent with the reciprocal relationship between the space and spatial frequency domains, the small locally restricted spatial differences between just distinguishable patterns are represented in the frequency domain by equally small differences, which are distributed over the entire spatial frequency spectrum. While they occur in many test situations, phase variations of spatial frequency components are not necessary for achieving optimum acuity and hyperacuity.
选择分辨率（视力）和差异空间定位（超视力）目标，以便进行严格的心理物理学测量，并能轻松表达其空间频谱和视网膜图像光分布。视力阈值约为1角分，超视力阈值为4 - 6角秒。正如空间域和空间频率域之间的倒数关系一样，在频域中，刚好可区分图案之间的局部小空间差异由同样小的差异表示，这些差异分布在整个空间频谱上。虽然它们出现在许多测试情况中，但空间频率分量的相位变化对于实现最佳视力和超视力并非必要。
