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Prior to now, automakers designed headlight lenses made from glass so they have been restricted within the dimension and form they may produce. Since then, auto manufacturers started designing vehicles with plastic or polycarbonate headlight lenses. This modification primarily occurred due to the change in the design of cars—automobiles turned lighter and more aerodynamic, plus plastic was by far inexpensive to supply than glass. At the moment this plastic material is the chosen choice because it is very mild and could be remodeled into unlimited sizes and shapes to fulfill new automotive designs.

Polycarbonate has its advantages but in addition has its disadvantages—specifically oxidation / discoloration.
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