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In the laboratory, the prescription eye glasses start off as lens blanks, which are either made from a plastic or glass disc that is about four inches wide and up to one and one-half inches thick. The blank lens has a flat back surface and a curved front surface.
What is glass paper made from? It is made from paper coated in a thin layer of glue and then  dusted in glass powder. What is a glass made of? Primarily silicon (sand) with the addition of some chemicals to purify and give it clarity and stability.