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Yes, I'm currently undergoing radiotherapy to the brain and see flashing lights during the treatment.
I can't find an explanation for it online, but my best guess is that the high energy x-ray photons are stimulating some kind of electrical or electrochemical response somewhere in the optic system. Based on what it looks like (even though my eyes are closed), the patterns that I "see" suggest this is probably happening on the retina as the blod vessels and ocular discs are very distinct.
Hope this helps.
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