A Novel Holographic Based Iol Characteri̇zati̇on Method

Published 2024 - 42nd Congress of the ESCRS

Reference: FP27.11 | Type: Free paper | DOI: 10.82333/tr2w-4g06

Authors: Afsun Sahin* ¹ , Hakan Urey ² , Koray Kavaklı ² , Ugur Aygun ² , Arda Gulersoy ²

¹Department of Ophthalmology,Koc University,Istanbul,Türkiye, ²Department of Electrics and Electronics,Koc University,Istanbul,Türkiye

Purpose

Intraocular lens (IOL) options are being increased in the last decade significantly. This makes a confusion among doctors and patients. In order to match patient with right IOL, there are a number of IOL simulators for cataract patients. However, they do not work well for patients with moderate or dense cataractous lenses due to impaired vision and heavy scattering. Some models utilized optical bench setups to evaluate the performance of IOLs in vitro.

While these evaluations provide more objective data, they are not easily accessible to cataract patients or ophthalmologists who work with them. We developed a holographic vision simulator combined with an artificial eye model which can hold a physical IOL.

Setting

Our model enables us to preoperatively estimate the photic phenomena and side effects that patients might experience after IOL implantation, and characterize these visual functions using the artificial eye model. To validate our approach, we tested visual acuity, contrast sensitivity, and halo severity of a novel OptiWave engineered hydrophobic EDoF IOL (ALSEE Boost, Alsanza GmBH, Pfullingen, Germany) through the artificial eye model and simulated holographic results.

Methods

An artificial eye is used to measure the optical performance of a novel EDoF IOL(ALSEE Boost, Alsanza GmbH, Pfullingen, Germany), which are then modeled using phase holograms. The eye model consists of scleral contact lens, adjustable pupilla, and a liquid filled housing for the IOL and forms an image on a glass retina. We measured the contrast and resolution loss, halos around light sources, and point spread function (PSF) of the IOL. We calculated computer generated phase holograms to mimic the IOL and tested the vision simulator on different visual scenes like night driving etc.

Results

We evaluated the resolution limits of the IOL at various distances. The best achieved resolution of an image was 4.49 lp/mm(line pairs per millimeter). Combining the evaluation of contrast and the conversion of resolution limit, we concluded that monofocal IOL has around a 1.2% contrast decrease in low spatial frequencies.

The point spread function (PSF) of was calculated. We observed a continuous expansion in PSF for the IOL without any halo and glare. It has its best contrast (95%) around 5 cpd spatial frequency, and the contrast decreases as the spatial frequency increases, reaching nearly 0, around 32 cpd of spatial frequency. In the day scene, no halo or glare are observed. In both of the night scenes, no blur, and glare were observed.

Conclusions

To the best of our knowledge, this is the first study that applied the characterizations made by an artificial eye model to holographic content. Optiwave engineered novel EDoF IOL showed good visual performance at far, intermediate and near without any glare and halo. The holographic display setup also has the potential to be optimized into a compact design, allowing the display to be portable and wearable if needed.