Glasses
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Glasses are common but essential in our daily life.
However, we never wonder where it was generated. According
to Wikipedia, the earliest glasses may used by a Roman
Emperor Nero in the first century. He used an emerald to
see the fighting games.
Until now, glasses of various usages have been made.
Except for the basic need of vision correction and eyes
protection, a need of fashion has been grown up. People
wear glasses, or sunglasses, just to express their personal
style. In this tendency, glasses not only require for a
light weight and a precise vision, but also a fancy design.
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Reference: http://en.wikipedia.org/wiki/Glasses
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