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This CR39 bifocal lens has a straight line across the entire length. Also known as "Franklin" style bifocals. All Crystal Vision Lenses are made in the U.S., to exacting specifications, in an Essilor laboratory, and we are able to offer them at a great price point. This lens is a good choice for corrections up to +/-3.00, and it is available with a variety of options such as Transitions, UV protection, sunglasses or fashion tint, standard Anti-Reflective coating, and the top-quality Crizal Alize and Crizal Avance coatings. All of our lenses come with our Perfect Lenses Guarantee.