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Related Experiment Videos

Threshold equivalence between perimeters.

D R Anderson1, W J Feuer, W L Alward

  • 1Bascom Palmer Eye Institute, Miami, FL 33101.

American Journal of Ophthalmology
|May 15, 1989
PubMed
Summary
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Comparing visual field testing devices, this study found significant differences between Humphrey, Octopus, and Dicon perimeters. Conversion formulas for visual impairment testing showed moderate reliability across different automated perimeters.

Area of Science:

  • Ophthalmology
  • Visual electrophysiology
  • Medical device comparison

Background:

  • Accurate visual field testing is crucial for diagnosing and monitoring visual impairments.
  • Multiple automated perimeters exist, but direct equivalence is not always established.
  • Goldmann perimetry is a standard for visual impairment determination, requiring comparison with automated devices.

Purpose of the Study:

  • To determine the equivalence and establish conversion formulas between Humphrey, Octopus, and Dicon automated perimeters.
  • To compare manual kinetic Goldmann perimetry with automated static perimetry results.
  • To assess the reliability of converting visual field test results between different instruments.

Main Methods:

  • 49 eyes from 35 subjects underwent static threshold testing on three automated perimeters (Humphrey, Octopus, Dicon).

Related Experiment Videos

  • Each eye was tested twice on each automated perimeter and twice using manual kinetic Goldmann perimetry.
  • Stimulus sizes I4e and III4e from Goldmann perimetry were compared to dB values on automated perimeters.

    • Main Results:

    • Significant differences in decibel (dB) values were observed between perimeters: Octopus-Humphrey (3.3 dB), Dicon-Octopus (3.5 dB), and Dicon-Humphrey (6.5 dB).
    • Goldmann perimeter stimuli (I4e and III4e) showed varying dB equivalencies across the automated perimeters.
    • Conversion formula reliability for predicting results between instruments was only 10% less than test-retest reliability on the same perimeter.

    Conclusions:

    • Direct comparison of visual field test results between Humphrey, Octopus, and Dicon perimeters requires careful consideration of established differences.
    • Established conversion formulas provide a reasonably reliable method for comparing visual field data across different perimeters.
    • The study validates the use of conversion formulas by confirming their consistency with age-corrected normal values for each perimeter.