The nerdy ones that would be worn by a skinny, socially inept math & physics major needing a haircut, wearing a white shirt, too short black pants, and glasses with thick lenses in large, black plastic full-around frames with a piece of first aid tape holding things together at the nose bridge. ... Or maybe by an absent minded slightly unkempt retired college professor with a pipe, also known for mismatched loafers, wrinkled slacks, weird ties and suede jackets with elbow patches, also needing a haircut... :) :) ...