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Related Experiment Videos

Pattern reversal ERG with LED-stimulation using cyclic summation technique.

Barbara Link1, Anselm Jünemann, Folkert K Horn

  • 1Department of Ophthalmology, Augenklinik mit Poliklinik, Universität Erlangen-Nürnberg, Schwabachanlage 6, D- 91054, Erlangen, Germany. barbara.link@augen.imed.uni-erlangen.de

Documenta Ophthalmologica. Advances in Ophthalmology
|April 25, 2006
PubMed
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This study introduces a new method using LED arrays and cyclic summation (CS) to record pattern electroretinography (PERG) responses. This technique successfully detects inner retinal function up to 30 degrees eccentricity.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Multifocal pattern reversal stimulation is crucial for assessing inner retinal dysfunction.
  • Conventional methods often utilize monitor-based stimuli with m-sequence techniques.
  • A novel approach using LED arrays and cyclic summation (CS) for pattern electroretinography (PERG) is presented.

Purpose of the Study:

  • To describe and evaluate a pattern reversal electroretinography (PERG) evoked by LED arrays utilizing cyclic summation (CS).
  • To assess the feasibility of detecting inner retinal dysfunction using this novel stimulation method.

Main Methods:

  • Eight healthy subjects underwent examination using a 13-LED array setup with a 30 cm viewing distance and 0.58 cyc/deg check size.
  • Cyclic summation (CS) technique at 16 reversals per second (RPS) was employed for stimulation.

Related Experiment Videos

  • Luminance of bright fields was maintained at 340 cd/m2, with central and paracentral field arrangements.

    • Main Results:

    • Fourier analysis revealed the highest amplitude (0.87 microV) in the central field's 2nd harmonic wave.
    • Paracentral field amplitudes varied, with the nasal first paracentral field showing 0.28 microV.
    • Reproducible ERG responses were recorded up to an eccentricity of 30 degrees, decreasing with distance from the center.

    Conclusions:

    • LED stimulation using CS technique enables peripheral PERG recording up to 30 degrees eccentricity.
    • The study demonstrates that PERG responses are strongest centrally and diminish towards the periphery.
    • This method offers a viable alternative for detecting inner retinal dysfunction.