I think that's how he described it. Also like what you see after you look at a bright light, then look away, that shimmery-ness. When he sees that, he knows to take 2 ibuprofen right away, or the pain will be there in a few minutes.Does your DH get weird sparkly vision with ocular headaches?
Thank goodness he doesn't get that many, and that they come with a warning signal.