Don’t discount dysphotopsias, either positive or negative, after cataract surgery and IOL placement. The literature suggests that dysphotopsias are relatively rare, but patient reports suggest a different story.
New lens designs may reduce the problem in the future. The Masket lens, with a groove on the anterior surface, allows the lip of the optic to ride over the anterior capsule, reducing the potential for negative dysphotopsias. A bag-in-lens design serves the same purpose, putting the optic atop the bag rather than allow the bag to ride over the edge of the optic.
Another design adds peripheral concavity to the optic to better diffuse light entering the eye, reducing the potential for shadows.
“The treatment varies,” Dr. Mamalis said. “Depending on the patient, changes in IOL material, design and placement can decrease or treat these dysphotopsias when they occur.”
Nick Mamalis, MD
Dr. Mamalis is professor of ophthalmology, John A. Moran Eye Center, University of Utah, Salt Lake City. He did not indicate any proprietary interest in the subject matter.