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Reference.org
Cosmic ray visual phenomena
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<p> Cosmic ray visual phenomena, or light flashes (LF), also known as Astronaut's Eye, are spontaneous flashes of <a href="/facts/Light/jeofpMn4">light</a> <a href="/facts/Visual_perception/g7Tfaq2l">visually perceived</a> by some <a href="/facts/Astronaut/HB1bd6Lz">astronauts</a> outside the <a href="/facts/Magnetosphere/BXzgPoPy">magnetosphere</a> of the Earth, such as during the <a href="/facts/Apollo_program/IC1Ek1Ao">Apollo program</a>. While LF may be the result of actual photons of visible light being sensed by the retina, the LF discussed here could also pertain to <a href="/facts/Phosphenes/drX559kx">phosphenes</a>, which are sensations of light produced by the activation of neurons along the visual pathway. </p>