Assertion: radiance's power | /r/CapableOf | get to the retina of the eye
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text: While the irradiance on the entrance of the eye together with the area of the eye's pupil determines the total optical power getting to the retina of the eye (neglecting some power losses in the eye), the radiance determines the resulting optical intensity (or irradiance) on the retina, because the angular subtense of the retinal image is the same as the angular subtense of the Sun as seen from outside the eye.