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Related Experiment Videos

A comparison of two multifocal ERG systems.

M Bock1, M Andrassi, L Belitsky

  • 1Department of Pediatric Ophthalmology, Strabismology and Ophthalmogenetics, University of Regensburg, Germany. markus.bock@klinik.uni-regensburg.de

Documenta Ophthalmologica. Advances in Ophthalmology
|April 15, 2000
PubMed
Summary

Comparing multifocal electroretinography (MERG) systems VERIS and RETIscan revealed system-specific results. Adjusting parameters like luminance, contrast, and m-sequence-timing significantly reduces differences in First-Order Kernel (FOK) responses, particularly P1 peak times.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • The multifocal electroretinogram (MERG) is crucial for assessing retinal function.
  • Standardized recording parameters are essential for reliable MERG data acquisition.
  • Comparing different MERG systems, such as VERIS and RETIscan, is necessary to understand system-specific variations.

Purpose of the Study:

  • To compare First-Order Kernel (FOK) responses obtained from VERIS and RETIscan MERG systems.
  • To investigate the impact of various system parameters on MERG recordings.
  • To determine methods for reducing inter-system variability in MERG measurements.

Main Methods:

  • MERG recordings were performed on 15 normal subjects (21-36 years old).
  • Standard parameters of VERIS and RETIscan were used initially, followed by adjusting VERIS parameters to match RETIscan.

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  • Parameters varied included luminance, contrast, m-sequence-timing, and sampling rates.

    • Main Results:

    • System-specific differences in P1 peak times were observed between VERIS and RETIscan using standard settings.
    • Adjusting luminance, contrast, and m-sequence-timing significantly altered MERG results.
    • Optimizing m-sequence-timing and sampling rate reduced inter-system variability in P1 peak times.

    Conclusions:

    • MERG system parameters critically influence recording outcomes, leading to system-specific results.
    • Inter-system differences in P1 peak times can be minimized through careful parameter adjustment.
    • M-sequence-timing and sampling rate are key parameters for accurate and comparable MERG recordings.