Enhanced reconstruction of diffractive intraocular lens profiles via Gabor-based holographic wavelength multiplexing

Abstract

Multifocal intraocular lenses (MIOLs) have become a widely adopted solution for providing functional vision at multiple focal distances in presbyopic patients undergoing cataract surgery. As a result, reliable tools for the analysis and characterization of these lenses are of considerable interest in the ophthalmic industry. Recently, a compact lensless arrangement based on digital in-line holography in Gabor’s regime was introduced as a novel contactless method to assess the profile of MIOLs. Nevertheless, its main limitations were the presence of coherent noise and residual twin image-related artifacts. In this contribution, we further improve its performance by considering multi-illumination holographic recording of almost the complete MIOL surface. The proposed methodology significantly enhances the reconstructed diffractive profiles by increasing the reconstruction contrast, reducing coherent noise, and suppressing residual twin-image artifacts. In addition, it enables a better reconstruction of outer diffractive rings at the MIOL periphery. Experiments support those findings for three commercially available different types of MIOL (the Acriva Trinova from VSY Biotechnology, the Fine Vision POD F from PhysIOL, and the AT LISA Tri from Carl Zeiss Meditec). The proposed methodology offers a novel compact and cost-effective platform for the reconstruction and quantitative characterization of MIOL diffractive surface profiles.