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Related Experiment Videos

Normal variability of static perimetric threshold values across the central visual field.

A Heijl1, G Lindgren, J Olsson

  • 1Department of Ophthalmology, University of Lund, Sweden.

Archives of Ophthalmology (Chicago, Ill. : 1960)
|November 1, 1987
PubMed
Summary

Visual field testing variability increases with eccentricity, impacting age-corrected normal visual field interpretation. Statistical programs must account for location-dependent variability and non-Gaussian distributions for accurate analysis.

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Area of Science:

  • Ophthalmology
  • Visual Neuroscience

Background:

  • Computerized static threshold perimetry is crucial for assessing visual fields.
  • Understanding variability in normal subjects is essential for accurate clinical interpretation.

Purpose of the Study:

  • To assess the variability of results in normal subjects undergoing computerized static threshold perimetry within the central 30 degrees visual field.
  • To identify factors influencing this variability, including eccentricity and age.

Main Methods:

  • Analysis of threshold values from computerized static threshold perimetry in normal subjects.
  • Assessment of individual, test-to-test, and intratest variability.
  • Evaluation of age-related sensitivity decrements and their eccentricity dependence.

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Main Results:

  • Variability of threshold values was significantly higher in the midperiphery compared to central locations.
  • Age-related sensitivity decrement was eccentricity-dependent, leading to steeper age-corrected visual fields.
  • Distributions of individual deviations from age-corrected means were non-Gaussian.

Conclusions:

  • Variability in computerized visual fields is strongly influenced by test point location (eccentricity).
  • Age-related changes in visual fields are complex and location-dependent.
  • Accurate interpretation of visual field data and development of statistical analysis programs require consideration of eccentricity-dependent variability and non-Gaussian distributions.