Evaluating Rotational Stability of an Extended Depth of Focus Toric Intraocular Lens Using a Slit Lamp and Image-Based Analysis.

PURPOSE: 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.  .