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Anecdotal report of magnetophosphene perception in 50 mT 20, 50 and 60 Hz magnetic fields

  • M. Souques (a1), M. Plante (a2), G. Ostiguy (a2), D. Goulet (a2), F. Deschamps (a3), G. Mezei (a4), J. Modolo (a5) (a6), J. Lambrozo (a1) and A. Legros (a5) (a6)...

Abstract

Magnetophosphenes are described as flickering lights appearing in the visual field, due to retinal exposure to time-varying magnetic fields (MF). Human magnetophosphene perception (MP) serves as a scientific basis for international guidelines intending to limit exposure to electromagnetic fields in the extremely low frequency range. However, the flux density threshold at which MP occurs, as well as the dose and frequency responses of the phenomenon, are not clearly experimentally established. The 50–60 Hz threshold is extrapolated from data in the lower frequency range. The objective of this paper is to provide a descriptive anecdotal report of MP from 8 individuals exposed to 50 mT MF at 20, 50 and 60 Hz. They describe variations of flickering light perceptions in the visual field, matching the description by D’Arsonval (1896). This preliminary testing introduces a new experimental protocol, which will test the threshold for MP and other associated neurophysiological responses in humans.

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[1] D’Arsonval A. (1896) Dispositifs pour la mesure des courants alternatifs de toutes fréquences, CR de la Société de Biologie séance du 2 mai 1896, 100e série, 450-451.
[2]Hirata, A., Takano, Y., Fujiwara, O., Dovan, T., Kavet, R. (2011) An electric field induced in the retina and brain at threshold magnetic flux density causing magnetophosphenes, Phys Med Biol. 56, 4091-4101.
[3] ICNIRP (2010) Guidelines for limiting exposure to time-varying electric and magnetic fields (1 Hz to 100 kHz), Health Phys. 99, 818-836. Erratum (2011) Health Phys. 100, 112.
[4]Lövsund, P., Oberg, P.A., Nilsson, S.E.G., Reuter, T. (1980) Magnetophosphenes: a quantitative analysis of thresholds, Med. Biol. Eng. Comput. 18, 326-334.

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