The definition of plastic glasses
Plastic glasses are produced based on the materials of plastic. In early, the materials of eye glasses usually are man-made glasses, natural crystals or metal frames. The obvious drawback of the traditional Glass, crystal film, metal frame is that the lens of them are too brittle too broke; the excessive weight also bring uncomfortable feeling. Afterwards, there was appearing synthetic plastics technology, firstly it was appeared "plastic errands" glasses that wrapped in plastic fabrication of wire frames, and the glasses weights were reduced. At this time, there was someone inspired by children's toys and then tried to made plastic film glasses, because it can further reducing the burden for the glasses. But with the limited of materials technology, the early plastic lens was disappointing in wear resistance and the degree of transparency