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Special shaded visors were once allowed in American football; Jim McMahon, quarterback for the Chicago Bears and San Diego Chargers, famously used a sun visor during his professional football career due to a childhood eye injury and almost always wears dark sunglasses when not wearing a football helmet. Darkened visors now require a doctor's ...
Some current visors can also be extended along the side window to block sunlight all of the way to the "B" pillar to block the light for the driver or passenger. The sun visor's flap or core is typically made from pressboard with a piece of metal for its attachment onto a mounting bracket. [5] Some are made of molded substrates or polypropylene.
The first Sunglass Hut store opened in 1971 when optometrist Sanford L. Ziff set up in a freestanding kiosk in Miami's Dadeland Mall.The success of this kiosk prompted Ziff to open other Sunglass Hut locations in Miami, and by 1986, Ziff had opened approximately 100 Sunglass Hut outlets, achieving sales of $24 million a year.
For the same reason sunglasses and filters were used by the American Army, especially for aviation, indeed Polaroid glasses were thought to protect aviator from sunlight but also atomic bomb explosions. [8] Cool-Ray was a division of American Optical for the sunglasses. It was the originator of the polarized sunglass as it is known today.
helmets and visors intended for users of two- or three-wheeled motor vehicles. The European Commission is currently working to revise Directive 89/686/EEC. The revision will look at the scope of the Directive, the conformity assessment procedures and technical requirements regarding market surveillance.
The visors started out as clear or smoked, but now come in colors ranging from blue, gold, black, rainbow, silver, or amber. The clear visor/shield is used at the player's discretion. The NFL requires medical clearance related to migraines and sun sensitivity for tinted, sunglass like, visors. [ 2 ]
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