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Related Experiment Videos

Static threshold variability in the peripheral visual field in normal subjects.

W O Young1, W C Stewart, H Hunt

  • 1Department of Ophthalmology, Medical University of South Carolina, Charleston 29425.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|January 1, 1990
PubMed
Summary
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This study on visual field testing found that variations in visual field measurements are typically greater between individuals than within a single individual. Superior and nasal areas show the most variability outside the central visual field.

Area of Science:

  • Ophthalmology
  • Visual Science
  • Neuroscience

Background:

  • Assessing visual field variability is crucial for detecting glaucomatous changes.
  • Understanding normal fluctuation patterns aids in distinguishing pathology from natural variation.
  • The Humphrey Field Analyzer is a standard tool for visual field testing.

Purpose of the Study:

  • To evaluate the variability of point-wise static threshold values.
  • To analyze components of fluctuation outside the central 30 degrees field.
  • To establish normative data for visual field fluctuation in healthy individuals.

Main Methods:

  • Tested 20 normal individuals using the Humphrey Field Analyzer.
  • Measured point-wise static threshold values.

Related Experiment Videos

  • Quantified short-term fluctuation, long-term heterogeneous fluctuation, and long-term homogeneous fluctuation.

    • Main Results:

    • Mean short-term fluctuation: 2.37 dB.
    • Mean long-term heterogeneous fluctuation: 5.28 dB.
    • Mean long-term homogeneous fluctuation: 1.10 dB.
    • All fluctuation components were greatest in the superior quadrant.
    • Point-wise variation was highest superiorly and nasally, increasing with eccentricity.
    • Inter-individual variation exceeded intra-individual variation.

    Conclusions:

    • Outside the central 30 degrees, superior and nasal quadrants exhibit greater normal point-wise variation.
    • Changes in these areas require larger deviations to be considered significant compared to temporal or inferior quadrants.
    • Inter-individual variability is a significant factor in visual field testing interpretation.