I've noticed - and indubitably, others have, too, as noted on this TV Tropes page - that often, whenever a "nerdy" character wears glasses in anime, they have a spiral shape on them. Examples are easy to find, with popular examples including Saori from Oreimo:
In particular, I became curious upon noticing them in Berserk, on Puck's "business" glasses:
I was just wondering, since this trope seems so ubiquitous in Japanese cultures and rare in others - what is the origin of this design? What about the spiral shape is intended to elicit an aura of "geekiness", and what major origins or influences led to its widespread use today?