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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.
wikiHow to Become an Optometrist. Optometrists diagnose vision problems and prescribe corrective lenses and medications to treat them. They differ from ophthalmologists, who can also perform eye surgeries, and from opticians, who design, fit, and dispense lenses. If improving peoples' vision and overall quality of life is something that you are passionate about, then read this article to learn how to become an optometrist.