Geisler and Davila (1985) describe the foveal line-spread function reported by Campbell and Gubisch for white light and a 3-mm pupil as the sum of two Gaussians. The first Gaussian has a space constant of 2.04 minutes. The second Gaussian has a space constant of .58 minutes. They are added together with the first Gaussian multiplied by .417 and the second Gaussian multiplied by .5830. The weighted average space constant is 1.18882.
Gaussian Components for 3mm PSF
WeightWidth at Half-heightSpace Constant
Gaussian #1.4173.40203.82.04122.4
Gaussian #2.583.72143.26.43326.0
Weighted Average Gaussian1.98118.771.1888271.33

(matlab source)
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© 1995 Lance Hahn (lance@retina.anatomy.upenn.edu)