What are the flashes of light patients report seeing during brain radiotherapy?

For decades, theories have existed to explain patient reports of seeing light flashes during radiation therapy, even with their eyes closed. However, no one has been able to secure evidence of this sensation in humans to prove their theory. A team of researchers at Dartmouth’s and Dartmouth-Hitchcock’s Norris Cotton Cancer Center led by radiation oncologist Read more about What are the flashes of light patients report seeing during brain radiotherapy?[…]