Variation in resistance force during intraocular lenses injection by modern injectors and assessment of damage to the injector: a laboratory analysis.

Maximilian Friedrich, Victor A Augustin, Donald J Munro, Maximilian Hammer, Sonja Schickhardt, Hyeck-Soo Son, Gerd U Auffarth

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Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Maximilian FriedrichThe David J. Apple® Center for Vision Research, Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Baden-Wuerttemberg, Germany.

Victor A AugustinThe David J. Apple® Center for Vision Research, Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Baden-Wuerttemberg, Germany.

Donald J MunroThe David J. Apple® Center for Vision Research, Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Baden-Wuerttemberg, Germany.

Maximilian HammerThe David J. Apple® Center for Vision Research, Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Baden-Wuerttemberg, Germany.

Sonja SchickhardtThe David J. Apple® Center for Vision Research, Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Baden-Wuerttemberg, Germany.

Hyeck-Soo SonThe David J. Apple® Center for Vision Research, Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Baden-Wuerttemberg, Germany.

Gerd U AuffarthThe David J. Apple® Center for Vision Research, Department of Ophthalmology, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Baden-Wuerttemberg, Germany. Gerd.Auffarth@med.uni-heidelberg.de.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

This experimental study aimed to guide cataract surgeons in selecting suitable intraocular lens (IOL) injectors by evaluating the in vitro resistance force during IOL ejection and assessing associated injector damage across modern injector models. Twenty-five injectors from five manufacturers were tested using + 20 diopter lenses. IOLs were ejected into petri dishes, and resistance forces were continuously recorded with an automated digital force gauge. Parameters including maximum force and the area under the curve (AUC) were analyzed. After each ejection, injector nozzle tips were examined microscopically and graded for damage using the HeiScore. Significant differences in resistance forces were found among injector models (p < 0.05), with maximum forces ranging from 4.39 ± 0.45 N to 25.71 ± 6.62 N. The AUC also showed significant variability, indicating differing levels of force required for IOL delivery. No ejection complications occurred, though one injector model exhibited markedly higher nozzle damage compared to others. These findings demonstrate substantial variability in resistance and durability among modern IOL injectors and underscore the importance of understanding these differences to ensure safe, controlled, and efficient IOL implantation in cataract surgery.

Indexed as

Cataract ExtractionLenses, IntraocularLens Implantation, IntraocularHumansArea under the curveInjector systemIntraocular lensResistance force

Identifiers

PMID42091931

DOI10.1038/s41598-026-41145-7

PMCPMC13149619

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