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2. Corrective lens - Wikipedia

   en.wikipedia.org/wiki/Corrective_lens

   A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.

3. Vertex distance - Wikipedia

   en.wikipedia.org/wiki/Vertex_distance

   Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing the power of the lens relative to ...

4. Bifocals - Wikipedia

   en.wikipedia.org/wiki/Bifocals

   Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism.

5. 10 Great Sites to Buy Cheap Eyeglasses Online - AOL

   www.aol.com/10-great-sites-buy-cheap-140036394.html

   Here are 10 affordable places to buy your next pair of cheap prescription glasses online. 1. Warby Parker. If you’re looking for a lot of choice (and the modern convenience of trying on eyeglass ...

6. The 7 best websites to buy prescription eyeglasses online - AOL

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7. Videos for Online Glasses With Prism Correction

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8. The Best 11 Places to Buy Glasses Online - AOL

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