Optics

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**
	Weight	Width at Half-height		Space Constant
Component		minutes	seconds	minutes	seconds
Gaussian #1	.417	3.40	203.8	2.04	122.4
Gaussian #2	.583	.721	43.26	.433	26.0
Weighted Average Gaussian		1.98	118.77	1.18882	71.33

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