retIrradiance_PowerPerArea = RadianceAndPupilAreaEyeLengthToRetIrradiance(radiance_PowerPerAreaSr,radianceS,pupilArea,eyeLength)

Perform the geometric calculations necessary to convert a measurement of source
radiance to corresponding retinal irradiance.

Let x be the units of distance (m, cm, mm, um, etc.)

Input radiance_PowerPerAreaSr should be in units of power/x^2-sr-wlinterval.
Input radianceS gives the wavelength sampling information (nm).
Input pupilArea should be in units of x^2.
Input eyeLength should be the length of the eye in units of x

Output retIrradiance_PowerPerArea is in units of power/x^2-wlinterval.

Light power may be expressed in watts or quanta-sec or in your
favorite units. Indeed, it may also be passed as energy rather
than power.

This conversion does not take absorption in the eye into account,
as this is more conveniently foldeded into the spectral absorptance.

The wavelength sampling is not needed or used, and the world would be a
better place if it were not passed. But taking it out of the arg list
now would probably break a number of calling programs in an irritating

See also: PsychRadiometric, RetIrradianceAndPupilAreaEyeLengthToRadiance, PupilAreaFromLum, EyeLength.

3/6/13 dhb Wrote it.

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