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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.
Your eyeglass prescription also determines what kind of high-index material you might want for your lens. The highest index materials are used primarily for the strongest prescriptions. If you want high-index lenses, be sure to ask for them.