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Progressive lenses are a type of optical glasses lens used to correct distance, intermediate (computer usage), and near (reading usage) at the same time. They are also called Progressive Addition Lenses (PALs) because the distance prescription is at the top and gradually increases in power to your full reading prescription as you move down the lens.
The power in the lenses “progressively” changes from far to intermediate to your full reading power.
You should think of progressive lenses as no-line bifocals. Progressives make the transition between prescriptions much smoother, eliminating that obvious line between the sides of the lens with different prescriptions. This technology helps you see better in more instances.
Progressive lenses let multiple vision fields to be added to a single lens, and “progressively” adjust for distance, intermediate, and reading. Even if you wear over-the-counter readers, progressive lenses can be made for you.
To wear them is often described as watching a movie on the latest HD flat screen release, instead of on an old tube television set. You can also think about it this way: It’s like having three sets of lenses in one; all without ever having to change your eyeglasses.
Bifocal lenses provide a distinct near and far viewing area, but no intermediate area (3-20 feet away). The different viewing areas are separated by noticeable lines that can be awkward, abrupt, and frustrating to the wearer. Progressive lenses have no image jump, featuring a continuous field of vision. The upper part of the lens contains the distance power, the middle of the lens has the intermediate ranges and the lower portion, the reading part.