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Posterior lens dislocation during attempted phacoemulsification

S Chern1, C W Yung

  • 1Indiana University Medical Center, Department of Ophthalmology, Indianapolis 46202, USA.

Ophthalmic Surgery
|March 1, 1995
PubMed
Summary
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Posterior lens dislocation during phacoemulsification can occur due to an imperfect capsulorhexis. This technique can create a "trap door," leading to nuclear dislocation during cataract surgery.

Area of Science:

  • Ophthalmology
  • Surgical Techniques
  • Anatomy

Background:

  • Posterior lens dislocation during phacoemulsification is a known complication.
  • The precise mechanism leading to this event remains unclear.
  • Previous studies have proposed theoretical mechanisms.

Purpose of the Study:

  • To investigate and demonstrate the mechanism of posterior lens dislocation during phacoemulsification.
  • To identify contributing factors to this surgical complication.

Main Methods:

  • Retrospective chart review of cataract surgeries at Indiana University (1991-present).
  • Analysis of nine cases of posterior lens dislocation during phacoemulsification.
  • Cadaver eye studies to simulate and visualize the mechanism.

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Main Results:

  • Nine cases of posterior lens dislocation during phacoemulsification were identified.
  • Four cases required early conversion to a can-opener capsulotomy.
  • Cadaver studies revealed that an imperfect capsulorhexis can create a "trap door" facilitating posterior nuclear dislocation.

Conclusions:

  • An imperfect capsulorhexis is a key factor in the mechanism of posterior lens dislocation during phacoemulsification.
  • The formation of a "trap door" effect contributes to nuclear dislocation.
  • Understanding this mechanism can help prevent future occurrences.