27 1 / 2012
Phosphenes have also been created by intense, changing magnetic fields, such as with transcranial magnetic stimulation.
These fields can be positioned on different parts of the head to stimulate cells in different parts of the visual system.
They also can be induced by alternating currents that entrain neural oscillation as with trancranial alternating-current stimulation. In this case they appear in the peripheral visual field.
Astronauts exposed to radiation in space report seeing phosphenes.
(Source: vimeo.com)