A new presbyopia-correcting IOL has a novel optic combining two complementary diffractive technologies. Results from bench and clinical testing show it provides a full range of continuous, high-quality vision, minimizes dysphotopsias, and may be more tolerant to refractive errors than multifocal IOLs.
Findings from studies evaluating the performance of a new presbyopia-correcting IOL (Model ZXR00; Tecnis Symfony Extended Range of Vision IOL, Abbott Medical Optics) indicate that it provides a full range of continuous, high-quality vision and successfully addresses the limitations accompanying multifocal IOL technology.
The novel IOL possesses innovative surface design features that result in 50% less light loss than traditional diffractive technologies such as multifocal or trifocal IOLs, enhanced depth of focus, crisp image quality, and very low rates of visual symptoms. The Symfony Extended Range of Vision IOL has received the CE Mark, is available in Europe, and is being studied in a pivotal trial in the United States.
“Recent strategies for enhancing multifocal IOL technology have focused on ways to improve intermediate vision, and this has been accomplished with the introduction of trifocal designs and lenses with a lower add. However, because a multifocal optic distributes light to different foci, all multifocal IOLs suffer from problems with contrast sensitivity loss and dysphotopsias,” said Gerd U. Auffarth, MD, professor and chairman, department of ophthalmology, Ruprecht-Karls University of Heidelberg, Germany.
“This extended range of vision IOL represents an entirely new design concept that allows for an extended range of crisp vision and a high rate of spectacle independence while minimizing photic issues, such as halos and glare, to levels similar to those occurring with a monofocal IOL,” he said
Discussing the design of the new lens, Leonard Borrmann, PharmD, divisional vice president, research and development, Abbott Medical Optics, Santa Ana, CA, explained it combines two complementary diffractive technologies. The first technology uses a modification of the height and the profile of the diffractive echelette to elongate the focus, as compared with the diffractive echelletes in a multifocal that create two discrete foci.
“Typically, optics that create multiple foci or that elongate the focus suffer from some loss of image quality,” Dr. Borrmann said. “However, the Symfony IOL optic compensates for that problem by incorporating a second diffractive optic technology that reduces chromatic aberration and boosts image quality.”