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Encyclopedia of Ophthalmology pp 1–2Cite as

Pupil Dilator

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Definition

Device for pupil extension during ocular surgery.

Indication

The use of pupil dilators should be considered in cataract surgery with small nondilating pupils, iris prolapse, and intraoperative floppy iris syndrome.

Contraindication

None.

Use and Dosage

Different devices are currently available for intraoperative pupil dilation. Iris hooks are applied for four to five point iris retraction. Iris hooks are placed in sideports 1 mm posterior of the corneoscleral junction. Alternatively, ring expanders may be used for pupil expansion. Ring expanders reduce the risk of iris-sphincter damage due to a circumferential expansion of the pupil. Different devices are available and should be used according to the surgeon’s preference.

Adverse Reactions

Excessive stretching of the pupil may result in iris sphincter damage. Improper positioning and removal of pupil dilators may result in tears of the anterior capsule or iridodialysis.

Cross-References

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Further Reading

  • Cantrell MA, Bream-Rouwenhorst HR, Steffensmeier A, Hemerson P, Rogers M, Stamper B (2008) Intraoperative floppy iris syndrome associated with alpha1-adrenergic receptor antagonists. Ann Pharmacother 42(4):558–563, Epub 2008 Mar 25. Review

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  • Goldman JM (2007) Karp. Adjunct devices for managing challenging cases in cataract surgery: pupil expansion and stabilization of the capsular bag. Curr Opin Ophthalmol 18(1):44–51, Review

    Article  PubMed  Google Scholar 

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Author information

Authors and Affiliations

  1. Department of Ophthalmology, University of Regensburg Medical Center, Franz-Josef-Strauss-Allee 11, 93053, Regensburg, Germany

    Wolfgang Herrmann

  2. Department of Ophthalmology, Goethe-Universität Frankfurt/Main, 60590, Frankfurt/Main, Germany

    Thomas Kohnen

Authors
  1. Wolfgang Herrmann
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  2. Thomas Kohnen
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Corresponding author

Correspondence to Wolfgang Herrmann .

Editor information

Editors and Affiliations

  1. Dept of Ophthal & Optometry,AKH, Medical University of Wien Dept of Ophthal & Optometry,AKH, Wien, Austria

    Ursula Schmidt-Erfurth

  2. Department of Ophthalmology, Goethe University of Frankfurt am Main Department of Ophthalmology, Frankfurt am Main, Germany

    Thomas Kohnen

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© 2016 Springer-Verlag Berlin Heidelberg

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Herrmann, W., Kohnen, T. (2016). Pupil Dilator. In: Schmidt-Erfurth, U., Kohnen, T. (eds) Encyclopedia of Ophthalmology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35951-4_402-4

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  • DOI: https://doi.org/10.1007/978-3-642-35951-4_402-4

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Online ISBN: 978-3-642-35951-4

  • eBook Packages: Springer Reference MedicineReference Module Medicine

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