We measured the polychromatic point spread function (PSF) of a batch of DIOLs. The optical setup has been described elsewhere.16 Briefly, a diffused white light point source from a polychromatic LED (Luxeon, 400 to 750 nm) passed through a model eye that consisted of an artificial corneal lens and a wet cell with a replaceable DIOL. A CCD camera captured the discrete PSF images from the point source. Altogether 12 bifocal DIOLs (Alcon, SN6AD3, apodized diffractive structure at central 3.6 mm, 20.0 D, added power at the IOL plane) were randomly divided into two groups of equal samples. The converging beam from the artificial cornea of the model eye provided a central circular aperture of 4.0 mm at the anterior surface of the DIOL. For each DIOL, PSF images at 12 locations were tested, including nine through-focus locations and three decentrations. The through-focus PSFs were recorded by translating the CCD backward/forward covering to 0.4 mm with a 0.1 mm step, and the PSFs were also recorded at three decentrations by shifting the DIOL to right, left and down each by 0.5 mm. To avoid external off-axis aberrations, there was no objective lens used to magnify the PSF images.