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Axial length decrease accompanying successful glaucoma filtration surgery.

L F Cashwell1, C A Martin

  • 1Wake Forest University Eye Center, Bowman Gray School of Medicine, Winston-Salem, North Carolina 27157, USA. fcashwel@nr.infi.net

Ophthalmology
|December 22, 1999
PubMed
Summary
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Glaucoma surgery (trabeculectomy) can decrease axial length, potentially affecting intraocular lens calculations. Measure axial length before surgery to ensure accurate lens power, especially in phakic eyes.

Area of Science:

  • Ophthalmology
  • Glaucoma Surgery
  • Biometry

Background:

  • Glaucoma filtering surgery, such as trabeculectomy, is a common procedure to lower intraocular pressure.
  • Accurate axial length measurement is crucial for intraocular lens (IOL) power calculations in cataract surgery.

Purpose of the Study:

  • To evaluate changes in ocular axial length following successful trabeculectomy.
  • To determine the implications of these changes for IOL power calculations.

Main Methods:

  • Retrospective analysis of 62 phakic patients undergoing primary trabeculectomy.
  • A-scan biometry was used to measure axial length before and after surgery.

Main Results:

  • A mean decrease of 0.423 mm in axial length was observed post-trabeculectomy.

Related Experiment Videos

  • Decreased axial length was significantly associated with patient age and a substantial decrease in intraocular pressure.
  • Use of antimetabolites also showed a significant association with axial length reduction.

    • Conclusions:

    • Axial length decreased in over half of the patients after trabeculectomy.
    • These changes can impact IOL power calculations.
    • Pre-operative axial length measurement in phakic eyes is recommended to mitigate risks of inaccurate IOL power post-surgery.