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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.
Obviously we cannot measure your PD over the internet, so it is best to make sure your PD is included in your glasses prescription. The Diagram below represents a PD of 62mm. If your prescription does not contain your PD: 1  Ask to have it measured at an optical shop â some may charge a fee. 2  Contact an optical shop where you have previously purchased prescription glasses. Your PD has been measured if you have ever had prescription glasses made up. 3  Your previous optometrist may have a record of your PD.