New Study Shows Intraocular Lens Centration and Stability May Be Improved When Zepto Capsulotomy Platform is Used with Purkinje Reflections

Centricity Vision announced the publication of a clinical study describing how to use Purkinje reflections at patient fixation for capsulotomy centration and 360-degree capsular overlap with the Zepto platform to help achieve improved visual outcomes. 

Published in the Journal of Cataract & Refractive Surgery (JCRS), the study was authored by Vance Thompson, MD; Jack Holladay, MD; and David Sretavan, MD. It explains how surgeons may use the relationship between P1 and P4 Purkinje reflections to identify reliable markers for capsulotomy centration, and then create an automated capsulotomy using Zepto's precision pulse capsulotomy (PPC) technology.  

The study underscores the importance of centering the IOL on the patient’s visual axis, in conjunction with creating a 360-degree capsular overlap during surgery to maintain optimal lens positioning and stability, according to Centricity Vision.

“The changing landscape in cataract surgery has increased the demand for precision,” Dr. Thompson said in a company news release. “By improving IOL centration and creating a 360-degree capsular overlap, we can achieve and maintain better long-term visual outcomes for patients.” 

Using P1 and P4 Purkinje Images as Guides

Purkinje images are light reflections off the cornea and the lens that are often used for improving IOL centration. There are four Purkinje reflections, labeled P1 through P4, and they can determine the patient’s point of fixation to assist with optimal capsulotomy centration. The authors discuss the benefits of using Purkinje reflections as a surrogate sign for intraoperative patient fixation.  

“The precision of the Zepto technology is unique in the cataract surgery space. Surgeons are recognizing the advantages and utilizing the platform to achieve improved outcomes for their patients and practices,” said Centricity President and CEO Rob Thornhill.