Persol bifocal glasses are designed to keep you looking chic while your vision stays sharp. Like all Persol prescription eyeglasses, these bifocals are made by hand from natural materials like acetate, a cotton flower-derived, allergy free material that's durable and comfortable. Crystal lenses give wearers of bifocal eyeglasses by Persol great visual acuity, whether they're reading through the bottom lens or watching sports through the top lens. Persol products are all engineered for a maximum degree of comfort, and these prescription eyeglasses are no different; the "telatura" process eliminates sharp edges along the bridge of Persol eyeglasses, and the Persol's unique Meflecto technology eliminates pressure to your skull by evenly distributing weight across the entire glasses frame, not just the stems. For comfort, crystal clear optics, and long lasting durability, it's hard to beat Persol bifocal eyeglasses.