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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.
Left: High-index lenses can be much thinner and lighter, even in a strong prescription. (Image: Vision Consultants, Inc.) Right: The three basic types of eyeglass lenses: no correction (such as non-prescription sunglasses); farsighted lenses; and nearsighted lenses.