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Stimulus configuration and the format of the normal sensitivity gradient.

J G Flanagan1, J M Wild, J M Wood

  • 1School of Optometry, University of Waterloo, Ontario, Canada.

Documenta Ophthalmologica. Advances in Ophthalmology
|August 1, 1988
PubMed
Summary

Computer assisted perimetry (CAP) stimulus configurations impact visual field sensitivity gradients. Different stimuli, including light-emitting diodes (LEDs), affect results, suggesting factors beyond stimulus size influence perimetry outcomes.

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Area of Science:

  • Ophthalmology
  • Visual Science
  • Medical Technology

Background:

  • Computer assisted perimetry (CAP) is crucial for assessing visual field sensitivity.
  • Understanding how different stimulus configurations affect perimetry results is essential for accurate diagnosis.
  • Variations in stimulus type may influence the derived normal sensitivity gradient.

Purpose of the Study:

  • To investigate the effect of three distinct stimulus configurations on the normal sensitivity gradient in computer assisted perimetry.
  • To compare the sensitivity profiles generated by different perimeters and stimulus types.

Main Methods:

  • Two separate studies compared different CAP devices (Dicon, Topcon, Humphrey) using projected stimuli, standard LED stimuli, and 'black hole' LED stimuli.
  • Age and gender-matched subjects were examined along a specific visual field meridian.

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  • Stimulus parameters were standardized across instruments where possible.

    • Main Results:

    • The Topcon perimeter showed greater relative sensitivity than the Dicon across all eccentricities.
    • The rate of sensitivity change varied between instruments at different locations.
    • Dicon's central profile matched Humphrey size II, while peripheral results aligned with size I; Topcon's profile consistently matched Humphrey size II.

    Conclusions:

    • Stimulus size and spatial summation are not the sole determinants of sensitivity gradient variations.
    • Factors such as accommodative stimulus from 'black hole' LEDs, stimulus color, and thresholding strategy likely contribute to observed differences.