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function psf = WestPSFMinutes(radius)
%WESTPSFMINUTES Compute Westheimer estimate of human PSF
% psf = WestPSFMinutes(radius)
%
% Compute Westheimer's PSF function as a function
% of passed radius. Radius passed in minutes of arc.
%
% Formula from Westheimer G. 1986. The eye as an optical instrument. In
% Handbook of perception and human performance, KR Boff, L Kaufman,
% JP Thomas (eds). New York: Wiley. Equation 7.
%
% This is only approximately consistent with Westheimer's LSF estimate.
%
% This comes back normalized to a maximum of 1.
%
% See also WestLSFMinutes, DavilaGeislerPSFMinutes, LsfToPsf, PsfToLsf
% 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));
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