For those who always havee to wear thicker lenses, you should consider a high index lens. Because high-index will reduce the thickness in the center.And if you're a far-sighted suffer and on the edge if you're near-sighted. what's more the plastic frame will hide more of your lenses than a wire rim. Besides, you can request to have the polycarbonate lenses made with 1.0 mm thick centers which can also reduce the thickness. You can find these lenses on prescriptionglassesonline.net.