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Corneal shape changes after pars plana vitrectomy

C Wirbelauer1, H Hoerauf, J Roider

  • 1Augenklinik, Medizinische Universität zu Lübeck, Germany. cwirbelauer@pc2.ophtha.muluebeck.de

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|November 24, 1998
PubMed
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Pars plana vitrectomy (PPV) can cause significant temporary corneal astigmatism and shape changes. These corneal alterations typically stabilize to preoperative values within several weeks after surgery.

Area of Science:

  • Ophthalmology
  • Corneal Surgery
  • Refractive Surgery

Background:

  • Pars plana vitrectomy (PPV) is a common surgical procedure.
  • Corneal shape changes following PPV are not fully understood.
  • Investigating these changes is crucial for managing postoperative visual acuity.

Purpose of the Study:

  • To investigate corneal shape changes after pars plana vitrectomy (PPV).
  • To assess the impact of PPV on corneal curvature and astigmatism.
  • To determine the time course of these corneal alterations.

Main Methods:

  • Prospective, controlled clinical study.
  • 36 patients undergoing pars plana vitrectomy (PPV).
  • Corneal curvature and topography measured preoperatively, and at 1 week, 4 weeks, and 2-8 months postoperatively.

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Main Results:

  • Significant surgically induced astigmatism (mean 2.92 D) in the first postoperative week, decreasing over time.
  • Videokeratography confirmed corneal steepening and flattening in specific meridians.
  • Corneal changes were persistent in some cases, influenced by suture diameter and gas tamponade.

Conclusions:

  • Pars plana vitrectomy (PPV) can induce substantial temporary corneal astigmatism and shape changes.
  • Corneal alterations generally stabilize to preoperative values within several weeks.
  • Understanding the timeline of corneal changes is vital for postoperative refractive management.