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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.
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.
Several types of eye protection are offered, including ballistic goggles and sunglasses made by Eye Safety Systems, Inc. and Wiley X, and are available with prescription lens inserts. [31] Ballistic Hearing Protection is a two-sided earplug that offers Marines protection from audio damage. [32]
Safety glasses can often mount insert frames to mount prescription corrective lenses for users with suboptimal vision. Such insert frames are mounted behind the protective lens. In some applications, regular eye wear, if manufactured from high-impact materials, can be worn with removable side shields.
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. 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.
Luxottica was founded in Agordo by Leonardo Del Vecchio in 1961 as a sunglasses manufacturer selling and branding under its own name. Del Vecchio quickly acquired numerous businesses in the pursuit of vertical integration, buying distribution companies rapidly and signing its first designer licensing agreement with Giorgio Armani .
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