radiance_PowerPerAreaSr = RetIrradianceAndPupilAreaEyeLengthToRadiance(irradiance_PowerPerArea,irradianceS,pupilArea,eyeLength)
Perform the geometric calculations necessary to convert a measurement of retinal
irradiance to the source radiance that would produce it.
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 irradiance_PowerPerArea is in units of power/x^2-wlinterval.
Input irradianceS gives the wavelength sampling information.
Input pupilArea should be in units of x^2.
Input eyeLength should be the length of the eye in x.
Output radiance_PowerPerAreaSr is in units of power/x^2-sr-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
This conversion does not take absorption in the eye into account,
as this is more conveniently foldeded into the spectral absorptance.
3/6/13 dhb Wrote it.