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Phosphenes

Definition:

Visual sensations, such as flashes of light, that are not caused by an external source of light entering the eye, but arise as a result of mechanical, electrical or magnetic stimulation of the eyeball.

They don't impair vision and they are transitory.

They can occur for instance when a person is moving in a strong static magnetic field.

Source: GreenFacts

To read about this term in context:

GreenFacts Summary on Static Fields:

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