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Learning effect of Humphrey Matrix perimetry.

Samin Hong1, Kyungdoo Na, Chan Yun Kim

  • 1Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.

Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
|September 8, 2007
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Summary

The Humphrey Matrix perimetry, using frequency-doubling technology (FDT), demonstrated a significant learning effect on visual field indices like mean deviation (MD) and pattern standard deviation (PSD) in new users. However, Glaucoma Hemifield Test (GHT) results remained unstable.

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Area of Science:

  • Ophthalmology
  • Visual Science
  • Medical Technology

Background:

  • Humphrey Matrix perimetry utilizes frequency-doubling technology (FDT) for automated visual field testing.
  • This study investigates the learning effect of the Humphrey Matrix perimetry with a full-threshold 30-2 strategy.

Purpose of the Study:

  • To evaluate the learning effect of Humphrey Matrix perimetry in patients with primary open-angle glaucoma and healthy controls naive to FDT.
  • To assess changes in various visual field indices after repeated testing.

Main Methods:

  • Twenty-four glaucoma patients and 24 healthy controls with no prior FDT experience participated.
  • Humphrey Matrix perimetry (full-threshold 30-2 strategy) was administered three times within one month.
  • Visual field indices including Mean Deviation (MD), Pattern Standard Deviation (PSD), and Glaucoma Hemifield Test (GHT) were analyzed.

Main Results:

  • A significant learning effect was observed, with Mean Deviation (MD) showing greater defects in the first test compared to subsequent tests (p < 0.001).
  • MD improved by 2.80 dB in glaucoma patients and 1.71 dB in controls.
  • Pattern Standard Deviation (PSD) decreased with repeated testing, while test duration, fixation losses, and error rates remained stable. Glaucoma Hemifield Test (GHT) results were unstable.

Conclusions:

  • Humphrey Matrix perimetry exhibits a substantial learning effect on MD and PSD in FDT-naive individuals.
  • The Glaucoma Hemifield Test (GHT) component of the Humphrey Matrix perimetry demonstrated significant instability in this cohort.