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Exploring Test-Retest Variability Using High-Resolution Perimetry.

Takuya Numata1, Ted Maddess2, Chota Matsumoto1

  • 1Department of Ophthalmology, Kindai University Faculty of Medicine, Osakasayama City, Osaka, Japan.

Translational Vision Science & Technology
|October 20, 2017
PubMed
Summary
This summary is machine-generated.

Test-retest variability in visual field testing is reduced by addressing spatial variance in sensitivity, not just depth. Spatial variance is a stronger determinant of variability, suggesting methods to smooth sensitivity changes could improve glaucoma progression detection.

Keywords:
glaucomahigh-resolution perimetrytest–retest variability

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Area of Science:

  • Ophthalmology
  • Visual Neuroscience
  • Medical Technology

Background:

  • Test-retest variability (TRV) in visual field (VF) testing complicates the accurate assessment of glaucoma progression.
  • Understanding the sources of TRV is crucial for improving diagnostic accuracy and patient management.

Purpose of the Study:

  • To investigate the sources of TRV in high-resolution perimetry.
  • To determine whether spatial variance or absolute magnitude of sensitivity changes is more important in TRV.

Main Methods:

  • Repeated high-resolution perimetry was performed on 16 glaucoma patients (16 eyes) using a modified Octopus 900 protocol.
  • TRV was quantified using standard deviation of repeats (retest-SD) and mean sensitivity (retest-MS) at 61 VF locations.
  • Multiple regression models analyzed determinants of TRV, including spatial variance, sensitivity, age, sex, and eccentricity.

Main Results:

  • Both mean sensitivity (retest-MS) and spatial variance (retest-SD) were significant independent determinants of TRV.
  • Spatial variance (retest-SD) had a larger effect on TRV (0.47 dB/dB loss) compared to mean sensitivity (retest-MS, -0.04 dB/dB loss).

Conclusions:

  • Spatial variance in sensitivity is a stronger determinant of TRV than scotoma depth alone.
  • Interactions between small stimuli, rapid sensitivity changes, and fixational jitter likely contribute significantly to TRV.
  • Methods like increasing stimulus size or improving gaze tracking may reduce TRV and enhance glaucoma progression monitoring.