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  2. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    Cost: Progressive lenses are more expensive than bifocal and single-vision lenses due to higher manufacturing and fitting costs. Some research has been conducted to reduce the fabrication cost by precision injection molding. [6]

  3. Varilux - Wikipedia

    en.wikipedia.org/wiki/Varilux

    Closer to the product launch, numerous pricing strategies had been elaborated. In the end, Maintenaz's invention would be fixed between Essel's bifocal lens, the Diachrolux, and its trifocal lens, the Trilux. Without much brainstorming, Maintenaz's progressive lens was given a name following suit with the other premium products: Varilux. [7]

  4. Glasses - Wikipedia

    en.wikipedia.org/wiki/Glasses

    For people with presbyopia and hyperopia, bifocal and trifocal glasses provide two or three different refractive indices, respectively, and progressive lenses have a continuous gradient. [1] Lenses can also be manufactured with high refractive indices, which allow them to be more lightweight and thinner than their counterparts with "low ...

  5. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    Current bifocals and progressive lenses are static, in that the user has to change their eye position to look through the portion of the lens with the focal power corresponding to the distance of the object. This usually means looking through the top of the lens for distant objects and down through the bottom of the lens for near objects.

  6. California land to be returned to Yurok Tribe - AOL

    www.aol.com/california-land-returned-yurok-tribe...

    Some 125 acres bordering Redwood National and State Parks in California will be handed back to the Yuroks.

  7. Here Are Two Major Social Security Changes Retirees Need to ...

    www.aol.com/two-major-social-security-changes...

    All current recipients will receive a boost to their monthly benefit thanks to the Social Security cost-of-living adjustment (COLA). Here Are Two Major Social Security Changes Retirees Need to ...

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