I love these but have 2 pair. I added my PX. You add yrs at yr local Optometrist or glasses store. This oversized, thin metal frame has been turning heads since the 70s. Square 1971 Clear Evolve has non-prescription, photochromic lenses that shift from clear to grey in changing light conditions – so you'll never need to take them off. They lenses are crystal, for maximum clarity, filter 100% of UV rays and are finished with a front-side anti-reflective treatment. From sunrise run to sunset bar, if they’re always on you’re always covered. PRODUCT DIMENSIONS LENS HEIGHT 48.4 mm BRIDGE WIDTH 54 19 mm TEMPLE LENGTH 145 mm