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37. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, Interventionelle und Refraktive Chirurgie (DGII)

Deutschsprachige Gesellschaft für Intraokularlinsen-Implantation, Interventionelle und Refraktive Chirurgie (DGII)

02.03. - 04.03.2023, Weimar

Simulated ocular-biometry effects on add-power demand in multifocal intraocular lenses

Meeting Abstract

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  • Grzegorz Labuz - Heidelberg
  • I. D. Baur - Heidelberg
  • R. Khoramnia - Heidelberg
  • G. U. Auffarth - Heidelberg

Deutschsprachige Gesellschaft für Intraokularlinsen-Implantation, Interventionelle und Refraktive Chirurgie. 37. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie. Weimar, 02.-04.03.2023. Düsseldorf: German Medical Science GMS Publishing House; 2023. Doc23dgii55

doi: 10.3205/23dgii55, urn:nbn:de:0183-23dgii556

Veröffentlicht: 2. März 2023

© 2023 Labuz et al.
Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung). Lizenz-Angaben siehe http://creativecommons.org/licenses/by/4.0/.


Gliederung

Text

Purpose: Although multifocal intraocular lenses (IOLs) have unique and fixed addition values, the position of the secondary peak detected in defocus-curve measurements may show high intersubject variability. In this study, the add-power demand dependency on ocular biometry was assessed by means of ray-tracing simulations.

Methods: IOL-Master biometry reports of patients scheduled for routine cataract surgery were collected. In total, 34 eyes were included with the following parameters used to build a personalized eye model: corneal keratometry (KER), anterior chamber depth (ACD), and axial length (AXL). Ray-tracing software was applied for pseudophakic eye simulations. Each model featured a biconvex lens with radii of curvature adjusted for best distance vision. Then, trial glasses with -4D, -3D, -2D, and -1.5D were placed with a vertex distance of 12 mm. The required IOL-power change to induce a desirable near/intermediate effect at the spectacle plane was calculated with respect to the far-point condition.

Results: The mean (±standard deviation) KER was 7.79 ±0.24 mm, the ACD was 3.22 ±0.60 mm, and the AXL was 23.77 ±1.34 mm. In this population, the lowest and highest add power (IOL plane) varied by 0.39D, 0.52D, 0.76D, 0.98D for the -1.5D, -2D, -3D and -4D trial glass, respectively. A high correlation was found between the observed add-power change and the ACD, indicating a linear increase of the add-power demand for larger ACD values. By contrast, the AXL and the KER demonstrated poor or no correlation with the required IOL-power adjustment.

Conclusions: The ACD, which determines the effective lens position, affects the add-power demand of a pseudophakic patient despite a full far-distance correction. The reported change may contribute to the variability in defocus curves of multifocal patients observed clinically.