This is interesting. I frequently had them triggered by riding BART in the late afternoons in the winter, sun beating in through the dirty windows. Going through the tube (dark) and emerging in Oakland (raised track, clear view of the sky on both sides) had a double-digit % chance of giving me a migraine if my eyes were open at one point.
I can get them triggered by riding in a car in similar conditions, too, especially if the windows aren't squeaky clean. I frequently wonder why that is, something about the remaining spectrum of visible light when the windows are dirty?
I can get them triggered by riding in a car in similar conditions, too, especially if the windows aren't squeaky clean. I frequently wonder why that is, something about the remaining spectrum of visible light when the windows are dirty?