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Related Experiment Videos

Threshold variability with an automated LED perimeter.

D Desjardins1, D R Anderson

  • 1Bascom Palmer Eye Institute, Department of Ophthalmology, University of Miami School of Medicine, Florida 33101.

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

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The CooperVision Dicon AP 2000 perimetry may show higher variability in sensitive retinal areas due to negative differential thresholds. Adding a diffuser or shortening stimulus duration improves threshold consistency.

Area of Science:

  • Ophthalmology
  • Visual Science
  • Medical Device Technology

Background:

  • The CooperVision Dicon AP 2000 utilizes light emitting diodes (LEDs) in a dark cavity for visual field testing.
  • Standard projection perimeters present stimuli on an existing background illumination.

Purpose of the Study:

  • To evaluate the visibility threshold and test-retest variability of the CooperVision Dicon AP 2000.
  • To investigate the impact of negative differential thresholds on perimetric results.

Main Methods:

  • Comparison of the Dicon AP 2000 with projection perimeters across different retinal sensitivity levels.
  • Modification of the Dicon AP 2000 by adding a diffuser over the LEDs.
  • Assessment of threshold variability with varying stimulus durations.

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Main Results:

  • Visibility thresholds were generally comparable to projection perimeters, except in highly sensitive retinal areas.
  • A negative differential threshold (stimulus intensity lower than background) was observed in sensitive areas, leading to increased variability.
  • Adding a diffuser to create a pre-existing background eliminated excessive variability.
  • Reduced stimulus durations also decreased variability.

Conclusions:

  • The Dicon AP 2000's design can lead to increased variability in sensitive retinal regions due to negative differential thresholds.
  • Modifications, such as adding a diffuser or shortening stimulus duration, can improve the reliability of the Dicon AP 2000.
  • These findings suggest potential improvements for direct LED-based perimetry instruments.