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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.
Prescription reading glasses are made so that the optical center of the lens is lined up exactly at the center of the pupil. When the optical center is not lined up, you may end up looking through the side of the lens, which can cause eye strain and eye muscle imbalances.