When the vitreous (clear fluid, which is jelly-like and fills the middle portion of the eye) rubs or pulls on the retina, it creates an illusion ...
Any flashes in vision should be investigated by an eye doctor. Most are due to a tugging on the retina by the vitreous gel and are relatively harmless. However, a detached retina may also produce flashes and this is an emergency.
(Photopsia) Traction on the retina experienced visually as brief flashes of light--lightening streaks. Sometimes more noticeable with head movements. Sometimes a warning symptom of impending retinal tear or detachment.
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