Abstract

We determined the foveal optical modulation transfer functions of the human eye $(O)$ for pupil sizes of 1–8 mm by using two simple psychophysical techniques. O as a function of spatial frequency f could be described by $exp[-(f/f_c{)}^n]$ at any pupil size in our data as well as in the data available in the literature [J. Physiol. (London) 186, 558 (1966); Opt. Acta 21, 395 (1974); Vision Res. 33, 15 (1993); J. Opt. Soc. Am. A 11, 246 (1994)]. When all these estimates of $f_c$ and n were pooled the parameters were found to depend on the pupil diameter as $f_c=16.6-1.49p$ and $n=exp(0.840/p-0.318).$ This result indicates that at 1 mm $O(f)$ is close to the diffraction-limited system.

© 1998 Optical Society of America

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