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The military offers annual replacements for those who qualify, and personnel may request the government issued glasses in addition to several varieties of more attractive eyewear, in clear and tinted lenses, as well as prescription gas mask inserts and inserts for government-funded eye protection ballistic eyewear. [4]
Ballistic sunglasses or prescription eyeglasses must meet the same requirements. In brief, the U.S. military standard requires that ballistic eyewear must be able to withstand up to a 3.8 mm (.15 caliber) projectile at 195 m/s (640 ft/s)) for spectacles and 5.6 mm (.22 caliber) projectile at 168–171 m/s (550–560 ft/s) for goggles.
In addition to licensing prescription and non-prescription sunglasses frames for many luxury and designer brands including Chanel, Prada, Giorgio Armani, Burberry, Versace, Dolce and Gabbana, Michael Kors, Coach, Miu Miu and Tory Burch, [8] the Italian corporation further outright owns and manufactures Ray-Ban, Persol, Oliver Peoples, and Oakley.
A prescription of −1.00 +0.25 × 180 describes a lens that has a horizontal power of −1.00 D and a vertical power of −0.75 D. In the US, only ophthalmologists write prescriptions in + cylinder. An optometrist would write a prescription in - (minus) cylinder. All spectacle and contact lenses would be made in minus cylinder.
Google provided four prescription frame choices for $225 and free with the purchase of any new Glass unit. Google entered in a partnership with the Italian eyewear company Luxottica , owners of the Ray-Ban , Oakley , and other brands, to offer additional frame designs. [ 28 ]
Man with glasses. A woman with glasses. Glasses, also known as eyeglasses, spectacles, or colloquially as specs, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.
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