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Related Experiment Videos

The black hole effect in perimetry.

J M Britt1, R P Mills

  • 1Department of Ophthalmology, University of Washington School of Medicine, Seattle 98195.

Investigative Ophthalmology & Visual Science
|May 1, 1988
PubMed
Summary
This summary is machine-generated.

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Uncovered light-emitting diodes (LEDs) in automated perimeters increase test result variability. This "black hole" effect adds minor fluctuations, potentially impacting precise visual field testing.

Area of Science:

  • Ophthalmology
  • Visual Science
  • Medical Device Technology

Background:

  • Automated perimeters utilize light-emitting diodes (LEDs) for visual stimuli.
  • Concerns exist that uncovered LEDs (
  • black holes
  • ) may disrupt uniform background illumination, affecting test consistency.

Purpose of the Study:

  • To investigate the impact of uncovered LEDs on the reliability of visual field testing.
  • To quantify the variability introduced by the
  • black hole
  • effect in automated perimetry.

Main Methods:

  • A Dicon perimeter was modified by covering some LEDs with diffusing plastic.
  • Forty-one volunteers underwent repetitive visual field testing within the central 5 degrees.

Related Experiment Videos

  • Testing was conducted at 12 locations using both covered and uncovered LED stimuli.

    • Main Results:

    • Significantly higher variances in threshold determinations were observed with uncovered LEDs (p=0.0005).
    • The
    • black hole
    • effect contributed an average of 0.8 dB to short-term fluctuation.
    • Increased variability suggests potential for inconsistent results.

    Conclusions:

    • Uncovered LEDs in automated perimeters introduce significant variability in visual field testing.
    • The
    • black hole
    • effect is likely of minor clinical significance for routine testing.
    • Exacting quantitative perimetry may be affected by this phenomenon.