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Implications of selective amplification of the flicker-electroretinogram

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Summary

Problems inherent in the use of selective amplification of the flicker ERG (e.g., the influence of the waveform of the response) are discussed.

The critical frequency of flicker fusion (CFF) and the course of the Intensity / CFF curves depend completely on the procedure used for improving the signal-to-noise-ratio.

The computer of average transients (CAT) is superior to all other procedures meant for this improvement, although a less expensive and easy to handle procedure as selective amplification is quite suitable in the majority of cases in clinical practice.

Résumé

Les problèmes incorporés dans l'usage d'un amplificateur sélectif concernant l'influence de la forme de l'onde sont discutés.

La fréquence critique de fusion (FCF) estimée, et aussi l'évolution de la courbe Intensité / FCF, dépendent du procédé utilisé dans l'amélioration du rapport signal/bruit. Le calculateur des moyennes transitoires (CAT computer) est de beaucoup supérieur aux autres procédés correspondants, mais pour des applications cliniques l'amplificateur sélectif du flicker ERG est suffisant comme instrument peu coûteux, sûr, et facile à utiliser.

Zusammenfassung

Fragen in Bezug auf selektive Verstärkung des Flimmer ERGs, wie z.B. der Einfluss der Wellenform, werden diskutiert.

Die Bestimmung der Flimmerfusionsfrequenz (FFF) und die Intensität/ FFF Kurven hängen völlig ab von dem Verfahren, das benutzt wurde zur Vergrösserung des Störpegelabstandes.

Der Komputer ist allen anderen Verfahren überlegen, wenn es sich um diese Verbesserung handelt; für viele Zwecke in der klinischen Praxis genügen aber weniger kostspielige und einfachere Verfahren, wie selektive Verstärkung des Flimmer-ERGs.

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References

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Eye Clinic, Rotterdam Medical School and Laboratory for Medical Physics, Amsterdam University.

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Henkes, H.E., van der Tweel, L.H. Implications of selective amplification of the flicker-electroretinogram. Doc Ophthalmol 18, 447–451 (1964). https://doi.org/10.1007/BF00160596

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