By Rebecca Daly, InStyle
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1. Putting Them on Your Head

Though most people do it, any eyewear aficionado can tell you this is rule number one not to break. The reason is threefold:
  • With aviator styles—or any pair that has wire nosepieces, for that matter—your hair can get caught, which yanks your hair (ouch) and could even bend or break the bridge of the sunglasses.
  • Depending on the shape of your head, it can stretch out the earpieces of your sunglasses, making them too loose.
  • When you bend over or look down, they’re bound to slip off, eventually resulting in a broken or scratched pair.