Fig. 14. Results of experiments in which the contrast of the retinal image was determined for different pupil sizes, in a schematic eye fixed with a simulated monofocal and concentric bifocal lntraocular lens. Note the steep drop in contrast for a near object as the pupil enlarges. (Atebara N: lmage Contrast and the Optics of Multifocal lntraocular Lenses. Senior thesis. Harvard Medical School. 1991)