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After turning 40, founder Rick Hopper started using readers and began habitually losing, scratching and dropping his glasses. [1] In 2010, Hopper made prototypes using paperclips and magnets, solving the problem he had with trying to keep his glasses safe and secure. [1] It did not take long for consumer interest to grow.
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Higher-quality optical-grade glass materials exist (e.g. Borosilicate crown glasses such as BK7 ( n d = 1.51680 , V d = 64.17 , D = 2.51 g/cm³ ), which is commonly used in telescopes and binoculars, and fluorite crown glasses such as the best optical quality low dispersion glass currently in production, N-FK58 made by the German company Schott ...
Electro-optical often uses liquid crystals as the active medium. [1] Applying an electric potential to the liquid changes the refraction of the liquid. Early work on opto-mechanical methods was done by Martin Wright. [2] [3] Opto-mechanical spectacles allow focus control by the wearer via movement of a small slider located on top of the bridge.
Have streak-free glasses for years to come with this mega-popular mega-kit. Includes one bottle of gentle, effective cleaner and a microfiber cloth — all made in the U.S.A. $8 at Amazon
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