A phosphene is a phenomenon characterised by the experience of seeing light without light actually entering the eye.the word phosphene times from the greek words phoslight and phainein (to show). Phosphenes that are induced by movement or sound are often associated with optic neuritis. Astronauts exposed to radiation in space report seeng phosphenes.
Phosphenes can be directly induced by mechanical, electrical, or magnetic stimulation of the retina or visual system. Phosphene have also been reported by meditators (commonly called nimitta), people who go for long periods
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