It was observed that the luminance of the pupil is not proportional to the pupil area. For instance, the luminance of a 30 mm2 pupil was found to be only twice that of a 10 mm2 pupil.
It was determined that the intensity inside the pupil is unrelated to its dimensions. For example, the intensity in a 30 mm² pupil was observed to be just twice as much as in a 10 mm² pupil.