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Glasses USA is another online eyewear retailer offering a huge selection (as in over 7,000 frames) of cheap glasses. Unlike some of the competition, Glasses USA also offers free shipping and ...
Pair Eyewear lets you change your glasses by snapping on different magnetic tops. You can choose from dozens of styles, colors and themes, and save 15 percent with promo code YAHOO15.
Eyebuydirect is a subsidiary of EssilorLuxottica that sells prescription and non-prescription glasses online. Founded in 2005, it offers various types of lenses, frames, and features such as facial recognition and social network.
Pupillary distance (PD) is the distance in millimeters between the centers of each pupil. It is used to specify prescription eyewear and binocular viewing systems, and can be measured by an eye care professional or an app.
Distance vision corrections are made by re-adjusting the lens for distance, instead of by tilting and/or rotating the head to view object through the best part of the lens for the distance. Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi ...
Trifocal lenses are eyeglasses with three regions that correct for distance, intermediate and near vision. They are mostly used by people with advanced presbyopia and were invented by John Isaac Hawkins in 1827.
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