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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. 3  Your previous optometrist may have a record of your PD.  Alternatively, try measuring your own Pupillary Distance as explained below.
Best Answer: You can't convert it yourself. That's something that an optometrist or optician should do. I mean, obviously you can attempt it but I can assure you, you won't get it right. However, you don't need another eye exam, you have a prescription and you can use that.