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Detecting Change Using Standard Global Perimetric Indices in Glaucoma.

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The mean deviation (MD) index detects significant visual field deterioration earliest in glaucoma patients compared to pattern standard deviation (PSD) and visual field index (VFI). MD identified more eyes with rapid progression within the first five years.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Standard automated perimetry is crucial for monitoring glaucoma progression.
  • Various global indices summarize visual field test results, but their efficacy in early detection of deterioration varies.
  • Identifying the most sensitive index for early glaucoma progression detection is vital for timely intervention.

Purpose of the Study:

  • To compare the performance of three global indices: mean deviation (MD), pattern standard deviation (PSD), and visual field index (VFI).
  • To determine which index can detect significant visual field deterioration earliest at a fixed specificity level.
  • To evaluate the clinical utility of different indices in identifying rapid glaucoma progression.

Main Methods:

  • A test-retest cohort (45 eyes) and a longitudinal cohort (508 eyes) were analyzed.
  • Three global indices (MD, PSD, VFI) were extracted from standard automated perimetry results.
  • Survival analysis was used to compare the time to detect significant deterioration, with criteria set for 95% specificity.

Main Results:

  • Mean deviation (MD) detected significant deterioration at a median of 7.3 years.
  • Visual field index (VFI) detected deterioration at 8.5 years, and pattern standard deviation (PSD) at 10.5 years.
  • MD identified significantly more eyes with deterioration within the first 5 years compared to VFI and PSD.

Conclusions:

  • Mean deviation (MD) is the earliest and most sensitive index for detecting significant visual field deterioration in glaucoma.
  • MD is particularly effective in identifying eyes with more rapid progression in the early stages of follow-up.
  • These findings support the use of MD for earlier detection and management of glaucoma progression.