Skip to main content
Log in

A comparison of two multifocal ERG systems

  • Published:
Documenta Ophthalmologica Aims and scope Submit manuscript

Abstract

The First Order Kernel responses (FOK) from a group of 15 normal subjects aged 21–36 yrs were recorded under clinical conditions with the multifocal ERG (MERG) systems VERIS and RETiscan using system-specific software and hardware under various parameter settings. First, the multifocal ERG's of normal subjects were recorded with the standard-parameters of VERIS and RETIscan. Thereafter the VERIS system parameters were set as close as possible to the RETIscan-setup, and the recordings were repeated. The VERIS parameters changed were the luminance- and contrast-settings of the stimulus-monitor and m-sequence-timing. In addition, the effects of different sampling rates were also examined. The consequences of the parameter changes were analyzed by displaying the peak times of the First-Order-Kernel (P1). The parameter-combinations used for recording lead to system-specific results. By varying the luminance/contrast settings and/or the m-sequence-timing the results can be changed. The amplitude of the recorded results can be influenced by the luminance-settings of the stimulus-monitor, and the topography of the P1 peak times is affected by the m-/f-frame-combination of the recording stimulus. With their standard parameters, the two systems give different measures of the P1 peak times. By adjusting the recording parameters, these differences can be reduced significantly. The main parameter here is the m-sequence-timing, although the sampling rate must also be taken into account with regard to the accuracy of the recording results.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Sutter EE, Tran D. The field topography of ERG components in man-l. The photopic luminance response. Vision Research 1992; 32: 433–46.

    Article  PubMed  CAS  Google Scholar 

  2. Bearse MA, Sutter EE. Imaging localized retinal dysfunction with the multifocal electroretinogram. J Opt Soc Am A 1996; 13: 634–40.

    Article  Google Scholar 

  3. Hood DC, Seiple W, Holopigian K, Greenstein V. A comparison of the components of the multifocal and full-field ERGs. Vis Neurosci 1997; 14: 533–44.

    Article  PubMed  CAS  Google Scholar 

  4. Hood DC, Li J. A technique for measuring individual multifocal ERG records. In: Yager D, eds. Non-invasive assessment of the visual system. Opt Soc Am 1997; 11: 33–41.

    Google Scholar 

  5. Hood DC, Holopigian K, Greenstein V, Seiple W, Li J, Sutter EE, Carr RE. Assessment of local retinal function in patients with retinitis pigmentosa using the multi-focal ERG technique. Vision Res 1998; 38: 163–79.

    Article  PubMed  CAS  Google Scholar 

  6. Seeliger M, Kretschmann U, Apfelstedt-Sylla E, Zrenner E. Implicit Time Topography of Multifocal Electroretinograms. Vision Res 1996; 36: 64.

    Google Scholar 

  7. Seeliger M, Kretschmann U, Apfelstedt-Sylla E, Ruther K, Zrenner E. Multifocal electroretinography in retinitis pigmentosa. Am J Ophthalmol 1998; 125: 214–26.

    Article  PubMed  CAS  Google Scholar 

  8. Kretschmann U, SeeligerM, Ruther K, Usui T, Apfelstedt-Sylla E, Zrenner E.Multifocal electroretinography in patients with Stargardt's macular dystrophy. Br J Ophthal 1998; 14: 267–75.

    Article  Google Scholar 

  9. Keating D, Parks S, Evans AL, Williamson TH, Elliot AT, Jay U. The effect of filter bandwidth on the multifocal electroretinogram. Doc Ophthalmol 1997; 92: 291–300.

    CAS  Google Scholar 

  10. Hennessy MP, Veagan. Amplitude scaling relationships of Burian-Allen, gold foil and Dawson, Trick and Litzkow electrodes. Doc Ophthalmol 1995; 89: 235–48.

    Article  PubMed  CAS  Google Scholar 

  11. McCulloch DL, Van Boemel GB, Borchert MS. Comparisons of contact lens, foil, fiber and skin electrodes for pattern electroretinograms. Doc Ophthalmol 1998; 94: 327–40.

    CAS  Google Scholar 

  12. Bock M, Andrassi M, Gerth C, Lorenz B. Spectral mapping of FOK and SOK responses from multifocal ERGs. Proceedings of the 37th ISCEV Meeting, Eilat, 11.4.-16.4.1999, ISCEV abstract book 1999; 15.

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Bock, M., Andrassi, M., Belitsky, L. et al. A comparison of two multifocal ERG systems. Doc Ophthalmol 97, 157–178 (1998). https://doi.org/10.1023/A:1002093106520

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1023/A:1002093106520

Navigation