Glass lenses have much better optics than plastic lenses, and have much better scratch resistance. PLEASE ALLOW 2-3 WEEKS FOR PROCESSING GLASS LENSES. Bifocal lenses made with the glass lenses material for bifocal vision distance viewing means that the reading area has a half moon shape with a "flat top", in the bottow area of the lens. The standard glass, flat top 28 bifocal has a reading area that is 28mm wide at the top. This is a good choice for prescriptions up to +/-3.00 sphere; above that, we would recommend a higher index lens in order to reduce the thickness and weight of the lens. This lens is available in the following range: -5.00 to +3.00 sphere, -4.00 to +3.00 cylinder, and up to +3.00 add (prism and slab off excluded).
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, and standard Anti-Reflective coating. All of our lenses come with our Perfect Lenses Guarantee.
There are no warranties available on glass lenses. Returns on glass lenses are for the one-time free redo only.