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Laser trabeculoplasty--argon or diode?

A M Brooks1, W E Gillies

  • 1Royal Victorian Eye and Ear Hospital, East Melbourne, Australia.

Australian and New Zealand Journal of Ophthalmology
|August 1, 1993
PubMed
Summary
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Diode laser trabeculoplasty (DLT) and argon laser trabeculoplasty (ALT) show comparable intraocular pressure (IOP) lowering effects. However, ALT demonstrated a statistically significant greater reduction in IOP, particularly in paired fellow eyes.

Area of Science:

  • Ophthalmology
  • Medical Technology

Background:

  • Trabeculoplasty is a common glaucoma treatment.
  • Argon laser trabeculoplasty (ALT) is the established method.
  • Diode laser trabeculoplasty (DLT) is a newer alternative with different wavelengths.

Purpose of the Study:

  • To compare the intraocular pressure (IOP) lowering efficacy of DLT versus ALT.
  • To evaluate differences in IOP reduction between the two laser modalities.

Main Methods:

  • A comparative study involving 50 patients undergoing trabeculoplasty.
  • Patients received either ALT or DLT.
  • Intraocular pressure (IOP) was measured at three months post-procedure.
  • Paired fellow eyes were also analyzed for direct comparison.

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Main Results:

  • Mean IOP reduction was not significantly different between ALT and DLT in unpaired eyes (23 to 18 mmHg for ALT vs. 23 to 19 mmHg for DLT).
  • A significantly greater number of patients achieved a ≥5 mmHg IOP fall with ALT compared to DLT in unpaired eyes (28 vs. 17).
  • In paired fellow eyes, ALT resulted in a statistically significant greater IOP reduction (22 to 17 mmHg) than DLT (22 to 19 mmHg).

Conclusions:

  • Diode laser trabeculoplasty offers a comparable pressure-lowering effect to argon laser trabeculoplasty.
  • Argon laser trabeculoplasty appears to be more effective in achieving a significant reduction in intraocular pressure, especially when comparing fellow eyes of the same patient.