Hacskaylo M
J Opt Soc Am. 1980 Feb;70(2):246-8. doi: 10.1364/josa.70.000246.
An analysis of the Tiffany data resulted in new relationships between the contrast threshold response of the human eye, the foveola region, and foveal-parafoveal vision as a function of background luminance for various stimulus diameters.