Positioning structure for auxiliary eyeglasses

A positioning structure for auxiliary eyeglasses, comprising main eyeglasses having a main function, an auxiliary eyeglass frame for supporting lenses having an additional function, and a protective strip, the positioning structure characterized in that:

• the auxiliary eyeglass frame attached to a main eyeglass frame of the main eyeglasses has a bridge provided with a receiving space and a through hole formed on a back wall of the receiving space while the protective strip combined to the auxiliary eyeglass frame is provided with an inserting portion extending downwardly from a central portion and having a first projection projected rearward, and a pair of second projections on each end corresponding to a recess formed on each end of the main eyeglass frame with an engaging point being projected downward from each of the relatively lower second projection;
• wherein the inserting portion of the protective strip is correspondingly inserted into the receiving space of the auxiliary eyeglass frame with the first projection of the inserting portion being engaged with the through hole of the receiving space, and the second projections on both ends of the protective strip are correspondingly inserted into the recesses of the main eyeglass frame with the engaging points of the lower second projections being tightly engaged with the recesses, so as to stably and speedily attach/detach the auxiliary eyeglass frame with the protective strip to/from the main eyeglass frame.