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Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.
Learn about glasses, also known as eyeglasses and spectacles, which are vision eyewear with clear or tinted lenses mounted in a frame. Find out about corrective, safety, sunglasses and other types of glasses, as well as their history and evolution.
Randolph Engineering is a company that produces sunglasses, shooting glasses, and prescription glasses in Randolph, Massachusetts. It also supplies aviator sunglasses to the U.S. military and other government agencies, and has a lifetime replacement guarantee for its products.
Warby Parker is an American company that sells prescription glasses, contact lenses, and sunglasses online and through more than 200 physical stores in the U.S. and Canada. Founded in 2010, it has a social entrepreneurship model of "buy one, give one" and operates its own optical lab.
Maui Jim is an American company that produces polarized sunglasses, eyewear, and apparel. It was founded in Hawaii in 1980 and is now owned by Kering Eyewear.
Learn how to interpret and write an eyeglass prescription that includes sphere, cylinder and axis components. Sphere and cylinder specify the power of the lenses, and axis defines the orientation of the cylinder relative to horizontal and vertical.
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