While a few mild soaps don't harm lenses

Solid Construction: Meticulously built to withstand regular use without succumbing to damage

Lens width about 2 1/16 inches (53mm)

the clip-on attaches securely and stays aligned during everyday use

4 Pack Thicker Frame Design Bifocal Reading Glasses BR9107 Transition Sunglasses While a few mild soapsAcrylic lens, plastic frame with spring hinges Frame width about 5 3 8 inches (137mm) Lens width about 1 15 16 inches (50mm) Lens height about 1 7 16 inches (37mm) Bridge(DBL) about 1 2 inches (13mm) Temple length about 5 11 16 inches (145mm) EYEKEEPER BIFOCAL GLASSES A crescent shape on the bottom part of the lenses have magnification, which is for reading and close up work. And the other parts of the lenses have no magnification,which is for