In Vitro Chromatic Performance of Three Presbyopia-Correcting Intraocular Lenses with Different Optical Designs

Abstract

Most of the new premium models of intraocular lenses for presbyopia correction use diffractive optics in their optical design. The presence of multiple foci and the difference of the diffractive efficiency for different wavelengths have a great impact in the lens optical performance. In this context, there is a limited information available for clinicians to understand the optical principles that differentiate each design and their potential influence on clinical outcomes. Optical bench studies with polychromatic light are necessary to solve this limitation. In this work, a custom made optical bench was employed to assess with polychromatic light the through the focus optical quality of three different IOL designs: trifocal, EDOF effect; and enhanced monofocal. By using different and complimentary approaches: images of the USAF test, axial PSFs and TF-MTFs, each design revealed its intrinsic features, which were not previously reported for these IOLs models in a comparative way. It was found that the chromatic aberration plays a very important role in the performance of each IOL. Our results could help clinicians to understand the optical principle of each lens and also provide useful information for choosing the lens that best suits the needs of the individual patient.

Keywords: EDOF IOLs; chromatic aberration; optical bench; presbyopia correcting IOLs; refractive segmented IOLs.

Figure 1

Scheme of the experimental setup.

Figure 2

Through-focus images of the studied IOLs for the (a) USAF test and (b) a 30 µm pinhole as object tests.

Figure 3

Experimental TF-MTFs obtained for the (a) xact, (b) AT LARA, and (c) FineVision for different wavelength monochromatic illuminations (450 nm, 550 nm, and 650 nm), and (d) for the three IOLs with polychromatic illumination.