Magnetophosphenes are described as flickering lights appearing in the visual field, dueto retinal exposure to time-varying magnetic fields (MF). Human magnetophospheneperception (MP) serves as a scientific basis for international guidelines intending tolimit 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 responsesof the phenomenon, are not clearly experimentally established. The 50–60 Hz threshold isextrapolated from data in the lower frequency range. The objective of this paper is toprovide 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 visualfield, matching the description by D’Arsonval (1896). This preliminary testing introduces a new experimental protocol, which willtest the threshold for MP and other associated neurophysiological responses in humans.
