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Maybe you are seeing Cherenkov radiation? Cosmic particles passing through the eye.

"Cherenkov radiation can be generated in the eye by charged particles hitting the vitreous humour, giving the impression of flashes"

http://en.m.wikipedia.org/wiki/Cherenkov_radiation#Character...




You'd have to be in the path of a cosmic ray shower ,near some dangerously critical nuclear decay, or near the beam-line of a particle accelerator.


Better check under the bed, then.




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