ENTOPTIC PHENOMENA WITH THE FIXOFLEX ENDOCAPSULAR DEVICE

Published 2025 - 29th ESCRS Winter Meeting

Reference: PO062 | Type: Free Paper | DOI: 10.82333/kyag-py74

Authors: Harilaos Ginis* ¹ , Dimitrios Christaras ¹ , Spyridon Tsoukalas ¹ , Ioannis Pallikaris ²

¹diestia,Athens,Greece, ²Department of Medicine,University of Crete,Heraklion,Greece

Purpose

fixOflex is a foldable endocapsular ophthalmic device designed for implantation in the capsule of the crystalline lens following phacoemulsification to preserve capsular shape and endocapsular space/volume and stabilize the intraocular lens. This study used a physical model of the pseudophakic eye to compare negative dysphotopsia and other entoptic phenomena between a standard Intraocular lens (IOL, Acrysof IQ SN60WF) and the same IOL implanted in a fixOflex device.

Setting

Laboratory testing, Diestia Systems, Athens Greece

Methods

The water-filled eye model had a PMMA cornea with a radius of 7.73mm (Q= -0.24) and an iris at 3.55mm from the anterior surface of the cornea. The IOL was positioned at 1.5mm from the pupil (ACD 5.05mm). In addition the IOL was positioned at the same plane stabilized in a fixoflex device. In both cases, images of a horizontal bar (5x15 degrees) at the peripheral visual field were recorded at the retinal plane using a camera in a water-tight casing. Negative dysphotopsia (ND) was quantified by comparing the retinal illuminance of regions within the dark band against adjacent areas.

Results

A characteristic shadow manifested on the retinal image at a visual angle of approximately 75 degrees for the isolated IOL, becoming more pronounced at a smaller pupil diameter (3 mm) compared to a larger one (5 mm). On the contrary, the lens implanted in the fixOflex device did not produce the shadow at any of the tested pupil diameters. No visually relevant positive dysphotopsia was recorded in either of these cases.

Conclusion

The incidence of negative dysphotopsia is diminished or entirely avoided by employing the fixOflex device. This conclusion aligns with results from non-sequential ray-tracing modeling (ZEMAX OpticStudio). The fixOflex ring, due to its design, diffuses the light transmitted around the edge of the IOL to an irregular pattern and the characteristic crescent does not appear.