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Related Experiment Videos

Assessing the 'cyclodiode G-probe' using a grey scale test: reproducibility and differences between probes.

P Hossain1, G Ghosh, S A Vernon

  • 1Academic Department of Ophthamology, University of Nottingham, Eye, Ear, Nose & Throat Centre, UK. parwex.hossain@nottingham.ac.uk

Eye (London, England)
|March 18, 2003
PubMed
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Many clinicians reuse G-probes for cyclodiode therapy. A simple method effectively assesses G-probe laser output, ensuring consistent treatment for predictable intraocular pressure reduction.

Area of Science:

  • Ophthalmology
  • Medical Devices
  • Laser Therapy

Background:

  • Cyclodiode therapy is used to manage intraocular pressure.
  • The G-probe is a critical component for delivering cyclodiode therapy.
  • Concerns exist regarding the reuse of G-probes and their consistent output.

Purpose of the Study:

  • To determine the prevalence of G-probe reuse among clinicians performing cyclodiode therapy.
  • To develop and validate a simple clinical method for assessing G-probe laser output.

Main Methods:

  • Questionnaires were distributed to ophthalmologists using the Oculight SLx Iris Medical Diode Laser to assess G-probe reuse practices.
  • A grey scale chart and custom probe holder were used to test G-probe output reproducibility.
  • Laser burns were analyzed to assess interprobe, interoperator, and intersheet variability.

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Main Results:

  • A high percentage of respondents (93.2%) perform cyclodiode therapy, with 58.5% reusing G-probes, often multiple times.
  • A reproducible method was established, consistently producing burns at grey density 8 with standard settings.
  • The test could detect a 20% increase in energy settings above 3 J, with power settings having a greater influence than time settings at 4 J and above.

Conclusions:

  • A significant number of UK clinicians reuse G-probes for cyclodiode therapy.
  • A simple, rapid, and reproducible method for assessing G-probe laser output has been demonstrated.
  • This assessment method can aid ophthalmic surgeons in testing G-probes before therapy, potentially leading to more predictable intraocular pressure reduction.