Abstract

Some intraocular lens (IOL) patients report seeing “dark shadows” at visual angles that are larger than 60°–70°. Raytrace models of the pseudophakic eye show that light starts to miss the IOL at large visual angles because the implant diameter of about 6 mm is much smaller than the natural crystalline lens diameter of 9.5 mm. This light forms a second displaced image on the peripheral retina. To evaluate the appearance of the image, raytrace software was used to image an illuminated window onto the highly curved retina, and a method was developed to project the image back to object space for evaluation on a flat surface. Only a single schematic eye was evaluated monochromatically and the low resolution of the peripheral retina was not modeled, but the simulated images depict a shadow-like phenomenon at similar visual angles to reports of “negative dysphotopsia.”

© 2014 Optical Society of America

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