The Ability of a Virtual Implantation Device to Evaluate Two Intraocular Lens Designs

Abstract

PURPOSE: To evaluate the ability of a novel device using virtual implantation to compare the visual performance of two different types of intraocular lenses (IOLs). METHODS: In this prospective, masked, and randomized clinical trial, the visual performance of monofocal and low-add bifocal IOLs was compared using a device for virtual implantation called VirtIOL. Eighty patients (< 50 years old with healthy eyes and without cataract) were enrolled in this study. Defocus curve and contrast sensitivity were measured using the Freiburg Vision and Contrast Test (FrACT). RESULTS: Expected defocus curves for the monofocal IOL and the bifocal IOL confirm the utility of the method. The monofocal IOL provided a slightly higher mean visual acuity at 0.00 diopter (D) (mean ± standard deviation: -0.18 ± 0.07 D) compared to the bifocal IOL (-0.16 ± 0.08 D), but also a slightly lower visual acuity from -1.25 to -4.00 D. The mean contrast sensitivity was significantly higher for the monofocal IOL at 7, 11, and 15 cycles per degree. The investigators attest a high usability of the method due to simple communication with the test patient and quick and uncomplicated change of test objects. CONCLUSIONS: The visual performance of the monofocal and bifocal IOLs was as expected, with greater depth of focus but reduced contrast sensitivity for the bifocal IOL. The VirtIOL device represents a promising tool to predict the visual performance of IOLs before implantation in patients.