<div dir="auto">Also called optical migraines.  I experience them as perfect, complex, geometric patterns which scintillate and exhibit various colors.  How does that come about from the glop that is my brain or retina or whatever?  It&#39;s all glop.<div dir="auto"><br></div><div dir="auto">Frank<br><br><div data-smartmail="gmail_signature" dir="auto">-----------------------------------<br>Frank Wimberly<br><br>My memoir:<br><a href="https://www.amazon.com/author/frankwimberly">https://www.amazon.com/author/frankwimberly</a><br><br>My scientific publications:<br><a href="https://www.researchgate.net/profile/Frank_Wimberly2">https://www.researchgate.net/profile/Frank_Wimberly2</a><br><br>Phone (505) 670-9918</div></div></div>