Clinical Ophthalmology (Aug 2020)
Evaluating Rotational Stability of an Extended Depth of Focus Toric Intraocular Lens Using a Slit Lamp and Image-Based Analysis
Abstract
Helga P Sandoval,1 Stephen Lane,2 Stephen Slade,3 Eric D Donnenfeld,4 Richard Potvin,5 Kerry D Solomon1 1Carolina Eyecare Physicians, LLC, Mt. Pleasant, SC, USA; 2Associated Eye Care, Stillwater, MN, USA; 3Slade & Baker Vision, Houston, TX, USA; 4Ophthalmic Consultants of Long Island, Long Island, NY, USA; 5Science in Vision, Bend, OR, USACorrespondence: Kerry D SolomonCarolina Eyecare Physicians, LLC, 1101 Clarity Road, Suite 100, Mt Pleasant, SC 29464, USAEmail [email protected]: To evaluate the rotational stability of a toric extended depth of focus (EDOF) intraocular lens (IOL), using either slit lamp evaluation or image-processing software.Setting: Three clinical practices in the USA.Design: Prospective unmasked randomized clinical trial.Methods: Subjects presenting for routine cataract surgery that were interested in improved near vision received toric EDOF lenses (TECNIS Symfony® Toric) in both eyes. The measures of interest in the current analysis were the change in orientation of the IOL between 1 day, 1 month and 3 months postoperative. Orientation was measured at the microscope on the day of surgery, and with the slit lamp at all other visits. Day 1, 1-month and 3-month images of the lens orientation were captured with a slit lamp camera. Differences in orientation were recorded and analyzed.Results: A total of 150 eyes had IOL orientation data available. Image analysis showed mean absolute lens orientation changes from 1 day to 1 month and 3 months of less than 2 degrees. The percentage of lenses exhibiting rotation of ≤ 5 degrees between any measured time points was 97% or higher. Results were similar, but significantly more variable, when IOL orientation was measured at the slit lamp.Conclusion: The toric EDOF lens evaluated here demonstrated rotational stability that exceeded the prior ANSI standard. The best method to determine IOL orientation changes was through image analysis. Keywords: TECNIS symfony toric, toric IOL, rotational stability
