Clip-on sunglasses are not actually sunglasses in the real sense, but they are an arrangement of a pair of lenses designed to fit on another pair of sunglasses. One can attach clip-ons to any pair of glasses and convert them into something totally different.Clip-ons are comprised of two lenses attachable by a spring mechanism. Each lens is fitted with rod and a tube towards the nasal side in such a manner that the rod of one lens enters the tube of the other and is held together by the spring mechanism.

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