Comment on "Line-separation discrimination curve in the human fovea: smooth or segmented"?

In a recent publication, Westheimer concluded that the foveal line-separation discrimination function was smooth [J. Opt. Soc. Am. A 1, 683-684 (1984)]. However, when the Westheimer data are replotted in the Weber-fraction (delta s/s) form, segments in the discrimination function similar to those previously described by Hirsch and Hylton [J. Opt. Soc. AM. 72, 1367-1374 (1984)] can be observed.