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Related Experiment Videos

Imaging zonular abnormalities using ultrasound biomicroscopy

C J Pavlin1, Y M Buys, T Pathmanathan

  • 1Department of Ophthalmology, Ontario Cancer Institute-Princess Margaret Hospital, Toronto. 73521.2371@compuserve.com

Archives of Ophthalmology (Chicago, Ill. : 1960)
|July 31, 1998
PubMed
Summary

Ultrasound biomicroscopy (UBM) effectively detects ciliary zonular defects, revealing signs like missing or stretched zonules. This imaging technique aids in understanding angle closure mechanisms related to these abnormalities.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Anatomy

Background:

  • Ciliary zonular defects can lead to various ocular complications.
  • Accurate detection of zonular abnormalities is crucial for appropriate clinical management.
  • Ultrasound biomicroscopy (UBM) offers high-resolution imaging of anterior segment structures.

Purpose of the Study:

  • To assess the utility of ultrasound biomicroscopy (UBM) in identifying ciliary zonular defects.
  • To characterize the specific ultrasound biomicroscopy findings associated with zonular abnormalities.

Main Methods:

  • Eighteen eyes with suspected zonular abnormalities underwent ultrasound biomicroscopy (UBM) evaluation.
  • Patients had predisposing factors such as pseudoexfoliation, spherophakia, trauma, or Marfan syndrome.

Related Experiment Videos

  • UBM was used to visualize zonular integrity and associated anterior segment changes.

    • Main Results:

    • UBM detected missing zonules in 11 eyes and zonular stretch in 11 eyes.
    • Increased lenticular sphericity was observed in all affected eyes.
    • Associated findings included ciliary body flattening (9 eyes), pupillary block (5 eyes), and angle crowding (3 eyes).

    Conclusions:

    • Ultrasound biomicroscopy (UBM) is a valuable tool for direct visualization of zonular loss and stretching.
    • Key UBM signs of zonular defects include increased lenticular sphericity and ciliary body flattening.
    • Pupillary block and iridal rotation are identified as angle closure mechanisms secondary to zonular issues.