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/usr/share/psychtoolbox-3/PsychOptics/WestPSFMinutes.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.

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function psf = WestPSFMinutes(radius)
% psf = WestPSFMinutes(radius)
%
% Compute Westheimer's PSF function as a function
% of passed radius.  Radius passed in minutes of arc.
%
% 7/11/94		dhb		Added comments, changed name.

psf = 0.952*exp(-2.59*(radius.^1.36)) + ...
       0.048*exp(-2.43*(radius.^1.74));