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2. Pupillary distance - Wikipedia

   en.wikipedia.org/wiki/Pupillary_distance

   As an alternative to having PD measured by an ECP, a variety of web and mobile (Android and iOS) apps are now widely available. Web apps are used by a variety of online sellers of eyeglasses where an object of known size, such as a credit card, is needed to assist (size reference) the measurement process.

3. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   An eyeglass prescription. Similar to medical prescriptions, eyeglass prescriptions are written on paper pads or included in a patient's electronic health record, and contain a number of different abbreviations and terms: DV is an abbreviation for distance vision. This specifies the part of the prescription designed primarily to improve far vision.

4. Pupilometer - Wikipedia

   en.wikipedia.org/wiki/Pupilometer

   In addition to having PD measured in a retail setting, a variety of web and mobile (Android and iOS) apps are now widely available. Web apps are used by a variety of online sellers of eyeglasses where an object of known size, such as a credit card, is needed to assist (size reference) the measurement process.

5. Vertex distance - Wikipedia

   en.wikipedia.org/wiki/Vertex_distance

   A phoropter measurement of a patient reads −8.00 D sphere and −5.25 D cylinder with an axis of 85° for one eye (the notation for which is typically written as −8 −5.25×85). The phoropter measurement is made at a common vertex distance of 12 mm from the eye.

6. I tried those Pair Eyewear glasses with the magnetic ... - AOL

   www.aol.com/lifestyle/tried-those-pair-eyewear...

   If you've never ordered glasses online before, you'll want to be sure to have an updated prescription close at hand, complete with pupillary distance (PD) measurements. You should also measure ...

7. Zenni Optical - Wikipedia

   en.wikipedia.org/wiki/Zenni_Optical

   To order glasses, customers need to provide their eyeglass prescription and a measurement of their pupillary distance (PD). [25] Zenni has a web page that supports measuring the PD. [19] Columnist Mary Hunt praised Zenni for offering "the absolute cheapest prices on plastic frames" and said it has "a wide range of frame styles and lens options ...